FNUS56 KPDT 181334 FWFPDT Fire Weather Planning Forecast for NE Oregon and SE Washington National Weather Service Pendleton OR 634 AM PDT Mon May 18 2026 .DISCUSSION... Light winds this morning will pick up out of the west gusting from 20 to 30 mph across the Cascade Gaps and through the Eastern Columbia Gorge, North Central Oregon and the Blue Mountains Foothills This Afternoon. ***Winds are 20 foot 10 minute averages *** ***CWR: Chance of wetting rain 0.10 or greater *** ***Ventilation Index is derived from transport wind multiplied by the mixing height in 100's of ft. Categories are a generalized indicator and users are encourage to develop criteria that are suitable and representative of dispersion conditions in their local area of interest. Categories: low (< 200), moderate (200-500), high (500-700), and very high (> 700). -Note: Max transport winds may not occur at the same time as max mixing height. *** WAZ695-182315- East Washington South Central Cascade Mountains- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Mostly cloudy then becoming partly cloudy. * Max temperature.....56-65...except 48-56 ridges. * Min humidity........34-49 percent. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds 4 to 10 mph. * Ridges/upr slopes....Northwest winds 5 to 11 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......8000 ft agl. * Transport winds.....Northwest around 10 mph. * Ventilation Index...Low (97-157) increasing to moderate to high (415-597) in the afternoon. .TONIGHT... * Sky/weather.........Partly cloudy. * Min temperature.....33-40. * Max humidity........72-87 percent. * Humidity recovery...Good...except Excellent ridges. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds 5 to 11 mph. * Ridges/upr slopes....Northwest winds 5 to 11 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....Northwest around 15 mph. * Ventilation Index...Moderate (212-358) decreasing to low (40-64) after midnight. .TUESDAY... * Sky/weather.........Mostly cloudy then becoming partly cloudy. * Max temperature.....58-67...except 50-58 ridges. * Min humidity........41-56 percent. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds 4 to 10 mph. * Ridges/upr slopes....Northwest winds 4 to 10 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......7000 ft agl. * Transport winds.....Northwest 10 to 15 mph. * Ventilation Index...Low (125-193) increasing to moderate to high (454-658) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 36 to 44. Highs 57 to 70. Northwest winds 5 to 11 mph. .THURSDAY...Partly cloudy. Lows 39 to 46. Highs 60 to 72. Northwest winds 2 to 7 mph. .FRIDAY...Mostly clear. Lows 41 to 47. Highs 61 to 73. West winds 3 to 8 mph. .SATURDAY...Partly cloudy. Lows 41 to 48. Highs 60 to 72. West winds 5 to 11 mph. .SUNDAY...Partly cloudy. Lows 39 to 46. Highs 57 to 69. West winds 6 to 12 mph. $$ WAZ690-182315- Kittitas Valley- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Partly cloudy. * Max temperature.....65-72...except 56-65 ridges. * Min humidity........25-34 percent. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds 5 to 11 mph. * Ridges/upr slopes....Northwest winds 5 to 11 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......9500 ft agl. * Transport winds.....Northwest around 10 mph. * Ventilation Index...Low (111-181) increasing to moderate to high (438-692) in the afternoon. .TONIGHT... * Sky/weather.........Partly cloudy. * Min temperature.....41-46. * Max humidity........61-76 percent. * Humidity recovery...Good...except Moderate ridges. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds 8 to 14 mph. Gusts to 30 mph in the evening. * Ridges/upr slopes....Northwest winds 9 to 15 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....Northwest 15 to 20 mph. * Ventilation Index...Moderate to high (353-535) decreasing to low (45-71) after midnight. .TUESDAY... * Sky/weather.........Partly cloudy. * Max temperature.....67-75...except 58-68 ridges. * Min humidity........30-40 percent. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds 5 to 11 mph. * Ridges/upr slopes....Northwest winds 5 to 11 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......8000 ft agl. * Transport winds.....Northwest 10 to 15 mph. * Ventilation Index...Low to moderate (114-204) increasing to high to very high (526-814) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 44 to 49. Highs 69 to 77. Northwest winds 8 to 14 mph. .THURSDAY...Partly cloudy. Lows 47 to 52. Highs 71 to 80. Northwest winds 4 to 9 mph. .FRIDAY...Mostly clear. Lows 48 to 53. Highs 73 to 81. Northwest winds 5 to 11 mph. .SATURDAY...Partly cloudy. Lows 48 to 53. Highs 72 to 81. Northwest winds 9 to 15 mph. .SUNDAY...Partly cloudy. Lows 46 to 51. Highs 69 to 77. West winds 9 to 15 mph. $$ WAZ694-182315- Yakama Alpine District- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Mostly cloudy then becoming partly cloudy. * Max temperature.....62-69...except 51-63 ridges. * Min humidity........28-42 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming west 4 to 9 mph in the afternoon. * Ridges/upr slopes....Northwest winds 2 to 7 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......9000 ft agl. * Transport winds.....Northwest 5 to 10 mph. * Ventilation Index...Low (48-94) increasing to moderate to high (326-518) in the afternoon. .TONIGHT... * Sky/weather.........Partly cloudy. * Min temperature.....35-42. * Max humidity........71-86 percent. * Humidity recovery...Good. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds 4 to 9 mph in the evening becoming drainage winds less than 5 mph. * Ridges/upr slopes....Northwest winds 3 to 8 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....Northwest around 10 mph. * Ventilation Index...Low to moderate (194-264) decreasing to low (25-42) after midnight. .TUESDAY... * Sky/weather.........Mostly cloudy then becoming partly cloudy. * Max temperature.....65-71...except 54-66 ridges. * Min humidity........33-48 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming west 4 to 9 mph in the afternoon. * Ridges/upr slopes....light less than 5 mph becoming west 3 to 8 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......7000 ft agl. * Transport winds.....West 5 to 10 mph. * Ventilation Index...Low (56-108) increasing to moderate to high (383-531) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 39 to 46. Highs 61 to 73. West winds 3 to 8 mph. .THURSDAY...Partly cloudy. Lows 42 to 49. Highs 65 to 78. Northwest winds 1 to 6 mph. .FRIDAY...Mostly clear. Lows 43 to 50. Highs 66 to 77. West winds 2 to 7 mph. .SATURDAY...Mostly clear. Lows 43 to 50. Highs 64 to 76. West winds 4 to 9 mph. .SUNDAY...Partly cloudy. Lows 41 to 48. Highs 61 to 73. West winds 4 to 10 mph. $$ ORZ691-WAZ691-182315- Lower Columbia Basin of Oregon-Lower Columbia Basin of Washington- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Partly cloudy then becoming mostly sunny. * Max temperature.....66-74...except 62-69 ridges. * Min humidity........23-32 percent. * 20-foot winds....... * Valleys/lwr slopes...West winds 4 to 9 mph. * Ridges/upr slopes....West winds 4 to 9 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......10000 ft agl. * Transport winds.....West around 10 mph. * Ventilation Index...Low (71-135) increasing to moderate to high (402-676) in the afternoon. .TONIGHT... * Sky/weather.........Partly cloudy. * Min temperature.....41-46. * Max humidity........66-80 percent. * Humidity recovery...Good. * 20-foot winds....... * Valleys/lwr slopes...West winds 4 to 10 mph. * Ridges/upr slopes....West winds 4 to 10 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....West around 10 mph. * Ventilation Index...Moderate (208-436) decreasing to low (26-46) after midnight. .TUESDAY... * Sky/weather.........Partly cloudy. * Max temperature.....69-76...except 65-71 ridges. * Min humidity........25-33 percent. * 20-foot winds....... * Valleys/lwr slopes...West winds 3 to 8 mph. * Ridges/upr slopes....West winds 4 to 9 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......9500 ft agl. * Transport winds.....West around 10 mph. * Ventilation Index...Low (82-164) increasing to moderate to very high (493-743) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 45 to 50. Highs 70 to 78. West winds 6 to 12 mph. .THURSDAY...Partly cloudy. Lows 47 to 52. Highs 75 to 82. Northwest winds 2 to 7 mph. .FRIDAY...Mostly clear. Lows 49 to 54. Highs 75 to 83. West winds 3 to 8 mph. .SATURDAY...Mostly clear. Lows 49 to 54. Highs 75 to 83. West winds 6 to 12 mph. .SUNDAY...Partly cloudy. Lows 47 to 52. Highs 73 to 80. Southwest winds 6 to 12 mph. $$ ORZ692-WAZ692-182315- Northern Blue Mountains of Oregon-Blue Mountains of Washington- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Partly cloudy. A slight chance of showers in the afternoon. * Max temperature.....56-65...except 49-55 ridges. * Min humidity........36-51 percent. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds 1 to 6 mph. * Ridges/upr slopes....Northwest winds 1 to 6 mph. * CWR.................0 percent. * Chc of lightning....10 percent (very low chance). * Mixing height.......8000 ft agl. * Transport winds.....Northwest around 10 mph. * Ventilation Index...Low (73-109) increasing to moderate to high (383-529) in the afternoon. .TONIGHT... * Sky/weather.........Mostly clear. * Min temperature.....35-42. * Max humidity........68-83 percent. * Humidity recovery...Good. * 20-foot winds....... * Valleys/lwr slopes...Southwest winds up to 5 mph. * Ridges/upr slopes....Southwest winds up to 5 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....West 5 to 10 mph. * Ventilation Index...Low (73-173) decreasing to low (25-36) after midnight. .TUESDAY... * Sky/weather.........Mostly sunny then becoming partly cloudy. * Max temperature.....60-69...except 54-60 ridges. * Min humidity........34-46 percent. * 20-foot winds....... * Valleys/lwr slopes...West winds 1 to 6 mph. * Ridges/upr slopes....light less than 5 mph becoming west 2 to 5 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......8000 ft agl. * Transport winds.....West 10 to 15 mph. * Ventilation Index...Low (104-144) increasing to high to very high (581-715) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 39 to 46. Highs 59 to 69. West winds 1 to 6 mph. .THURSDAY...Mostly clear. Lows 40 to 47. Highs 62 to 73. Northwest winds 1 to 6 mph. .FRIDAY...Partly cloudy. Lows 42 to 49. Highs 64 to 74. Southwest winds up to 5 mph. .SATURDAY...Mostly clear. Lows 43 to 50. Highs 66 to 76. Southwest winds 1 to 6 mph. .SUNDAY...Partly cloudy. Lows 42 to 50. Highs 65 to 75. West winds 2 to 7 mph. $$ ORZ693-WAZ693-182315- Canyon Grasslands of Wallowa County- Southeast Washington Grande Ronde Valley- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Partly cloudy. A chance of showers and a slight chance of thunderstorms in the afternoon. * Max temperature.....55-63...except 49-56 ridges. * Min humidity........38-49 percent. * 20-foot winds....... * Valleys/lwr slopes...North winds 2 to 7 mph. * Ridges/upr slopes....North winds 2 to 7 mph. * CWR.................0 percent. * Chc of lightning....20 percent (slight chance). * Mixing height.......8000 ft agl. * Transport winds.....Northwest 5 to 10 mph. * Ventilation Index...Low (29-97) increasing to moderate to high (388-574) in the afternoon. .TONIGHT... * Sky/weather.........Partly cloudy. * Min temperature.....32-40. * Max humidity........69-84 percent. * Humidity recovery...Good. * 20-foot winds....... * Valleys/lwr slopes...West winds up to 5 mph in the evening becoming drainage winds less than 5 mph. * Ridges/upr slopes....West winds 2 to 7 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....North around 5 mph shifting to the south after midnight. * Ventilation Index...Low (60-144) decreasing to low (25-26) after midnight. .TUESDAY... * Sky/weather.........Mostly sunny then becoming partly cloudy. * Max temperature.....61-69...except 55-62 ridges. * Min humidity........29-36 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph. * Ridges/upr slopes....light less than 5 mph becoming northwest 2 to 6 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......9000 ft agl. * Transport winds.....West 5 to 10 mph. * Ventilation Index...Low (71-105) increasing to high to very high (637-771) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 36 to 44. Highs 62 to 70. West winds 1 to 6 mph. .THURSDAY...Mostly clear. Lows 38 to 46. Highs 65 to 73. North winds 2 to 7 mph. .FRIDAY...Partly cloudy. Lows 40 to 48. Highs 67 to 76. West winds 1 to 6 mph. .SATURDAY...Mostly clear. Lows 41 to 49. Highs 70 to 79. West winds 2 to 7 mph. .SUNDAY...Partly cloudy. Lows 41 to 49. Highs 69 to 79. West winds 3 to 8 mph. $$ ORZ701-182315- Eastern Columbia River Gorge of Oregon- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Mostly cloudy then becoming mostly sunny. * Max temperature.....65-70. * Min humidity........27-38 percent. * 20-foot winds....... * Valleys/lwr slopes...West winds 1 to 6 mph increasing to northwest 7 to 13 mph with gusts up to 25 mph in the afternoon. In the eastern Columbia River Gorge, west winds 2 to 7 mph increasing to 9 to 15 mph in the afternoon. * Ridges/upr slopes....Northwest winds 4 to 10 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......8500 ft agl. * Transport winds.....West 10 to 15 mph. * Ventilation Index...Low (72-120) increasing to moderate to high (483-679) in the afternoon. .TONIGHT... * Sky/weather.........Mostly clear. * Min temperature.....39-44. * Max humidity........72-87 percent. * Humidity recovery...Good. * 20-foot winds....... * Valleys/lwr slopes...West winds 7 to 13 mph with gusts up to 25 mph decreasing to 2 to 7 mph after midnight. In the eastern Columbia River Gorge, west winds 6 to 12 mph, Gusts to 25 mph in the evening. * Ridges/upr slopes....West winds 6 to 12 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....West 10 to 15 mph. * Ventilation Index...Moderate (254-372) decreasing to low (30-48) after midnight. .TUESDAY... * Sky/weather.........Mostly cloudy then becoming partly cloudy. * Max temperature.....68-73...except 63-70 ridges. * Min humidity........31-41 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming northwest 5 to 11 mph in the afternoon. In the eastern Columbia River Gorge, west winds 2 to 6 mph increasing to 6 to 12 mph in the afternoon. * Ridges/upr slopes....West winds 3 to 8 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......6500 ft agl. * Transport winds.....West 10 to 15 mph. * Ventilation Index...Low (71-135) increasing to moderate to high (488-656) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 43 to 48. Highs 71 to 76. West winds 6 to 12 mph. .THURSDAY...Mostly clear. Lows 45 to 50. Highs 76 to 81. Northwest winds 1 to 6 mph. .FRIDAY...Mostly clear. Lows 47 to 52. Highs 75 to 80. West winds 4 to 9 mph. .SATURDAY...Mostly clear. Lows 46 to 51. Highs 74 to 79. West winds 6 to 12 mph. .SUNDAY...Partly cloudy. Lows 45 to 50. Highs 72 to 77. West winds 6 to 12 mph. $$ ORZ702-182315- East Slopes of the Mt. Hood National Forest- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Mostly cloudy then becoming mostly sunny. * Max temperature.....59-67...except 53-62 ridges. * Min humidity........29-44 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming northwest 1 to 6 mph in the afternoon. * Ridges/upr slopes....light less than 5 mph becoming northwest 2 to 7 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......8000 ft agl. * Transport winds.....Northwest around 10 mph. * Ventilation Index...Low (85-117) increasing to moderate (359-493) in the afternoon. .TONIGHT... * Sky/weather.........Mostly clear. * Min temperature.....33-40. * Max humidity........71-86 percent. * Humidity recovery...Good. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds 2 to 7 mph in the evening becoming drainage winds less than 5 mph. * Ridges/upr slopes....West winds 1 to 6 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....West 10 to 15 mph. * Ventilation Index...Low to moderate (189-259) decreasing to low (34-46) after midnight. .TUESDAY... * Sky/weather.........Partly cloudy. * Max temperature.....64-71...except 57-66 ridges. * Min humidity........33-48 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph. * Ridges/upr slopes....light less than 5 mph becoming northwest 1 to 5 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......6500 ft agl. * Transport winds.....West 10 to 15 mph. * Ventilation Index...Low (79-119) increasing to moderate to high (381-525) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 38 to 44. Highs 61 to 73. West winds 3 to 8 mph. .THURSDAY...Mostly clear. Lows 41 to 48. Highs 66 to 77. Northwest winds up to 5 mph. .FRIDAY...Mostly clear. Lows 42 to 49. Highs 65 to 77. West winds 1 to 6 mph. .SATURDAY...Mostly clear. Lows 42 to 48. Highs 64 to 76. West winds 3 to 8 mph. .SUNDAY...Partly cloudy. Lows 40 to 46. Highs 63 to 74. West winds 3 to 8 mph. $$ ORZ695-182315- Eagle Cap Wilderness- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Partly cloudy. A slight chance of rain and snow showers in the afternoon. * Max temperature.....52-62...except 40-52 ridges. * Min humidity........38-53 percent. * 20-foot winds....... * Valleys/lwr slopes...North winds 3 to 8 mph. * Ridges/upr slopes....North winds 4 to 9 mph. * CWR.................0 percent. * Chc of lightning....10 percent (very low chance). * Mixing height.......8000 ft agl. * Transport winds.....North 10 to 15 mph. * Ventilation Index...Low to moderate (125-251) increasing to high to very high (500-784) in the afternoon. .TONIGHT... * Sky/weather.........Partly cloudy. * Min temperature.....33-38...except 26-33 ridges. * Max humidity........65-77 percent. * Humidity recovery...Good. * 20-foot winds....... * Valleys/lwr slopes...North winds 2 to 7 mph in the evening becoming drainage winds less than 5 mph. * Ridges/upr slopes....Northwest winds 3 to 8 mph. * CWR.................0 percent. * Chc of lightning....10 percent (very low chance). * Mixing height.......500 ft agl. * Transport winds.....North 5 to 10 mph. * Ventilation Index...Low to moderate (121-223) decreasing to low (25-35) after midnight. .TUESDAY... * Sky/weather.........Mostly sunny then becoming partly cloudy. * Max temperature.....57-67...except 46-57 ridges. * Min humidity........25-37 percent...except 33-48 percent ridges. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph. * Ridges/upr slopes....light less than 5 mph becoming west 2 to 6 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......8500 ft agl. * Transport winds.....West 5 to 10 mph. * Ventilation Index...Low (52-118) increasing to high to very high (573-701) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 32 to 42. Highs 53 to 68. Northwest winds 1 to 6 mph. .THURSDAY...Mostly clear. Lows 34 to 43. Highs 56 to 71. North winds 4 to 9 mph. .FRIDAY...Partly cloudy. Lows 36 to 45. Highs 58 to 73. Northwest winds 2 to 7 mph. .SATURDAY...Mostly clear. Lows 37 to 46. Highs 61 to 76. West winds 3 to 8 mph. .SUNDAY...Partly cloudy. Lows 37 to 46. Highs 61 to 76. West winds 3 to 8 mph. $$ ORZ694-182315- Grande Ronde Valley of Oregon- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Partly cloudy. * Max temperature.....61-66. * Min humidity........31-36 percent. * 20-foot winds....... * Valleys/lwr slopes...North winds 4 to 9 mph. * Ridges/upr slopes....North winds 5 to 11 mph. * CWR.................0 percent. * Chc of lightning....10 percent (very low chance). * Mixing height.......8500 ft agl. * Transport winds.....North 10 to 15 mph. * Ventilation Index...Low (104-192) increasing to high to very high (623-907) in the afternoon. .TONIGHT... * Sky/weather.........Mostly clear. * Min temperature.....32-37. * Max humidity........77-92 percent. * Humidity recovery...Excellent. * 20-foot winds....... * Valleys/lwr slopes...North winds 3 to 8 mph in the evening becoming drainage winds less than 5 mph. * Ridges/upr slopes....North winds 4 to 9 mph in the evening becoming light winds less than 5 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....Northwest 5 to 10 mph. * Ventilation Index...Low to moderate (158-232) decreasing to low (25-26) after midnight. .TUESDAY... * Sky/weather.........Mostly sunny then becoming partly cloudy. * Max temperature.....65-70. * Min humidity........29-34 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph. * Ridges/upr slopes....light less than 5 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......8000 ft agl. * Transport winds.....West 5 to 10 mph. * Ventilation Index...Low (45-83) increasing to moderate to high (474-614) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 36 to 41. Highs 68 to 73. Northwest winds 1 to 6 mph. .THURSDAY...Mostly clear. Lows 38 to 43. Highs 71 to 76. Northwest winds 4 to 9 mph. .FRIDAY...Partly cloudy. Lows 40 to 45. Highs 72 to 77. Northwest winds 3 to 8 mph. .SATURDAY...Mostly clear. Lows 41 to 46. Highs 76 to 81. Northwest winds 3 to 8 mph. .SUNDAY...Partly cloudy. Lows 41 to 46. Highs 75 to 80. Northwest winds 3 to 8 mph. $$ ORZ699-182315- Western Forested Blue Mountains- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Partly cloudy. * Max temperature.....56-62...except 50-57 ridges. * Min humidity........26-37 percent. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds 2 to 7 mph. * Ridges/upr slopes....Northwest winds 2 to 7 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......9000 ft agl. * Transport winds.....Northwest 10 to 15 mph. * Ventilation Index...Low to moderate (95-215) increasing to high to very high (645-877) in the afternoon. .TONIGHT... * Sky/weather.........Partly cloudy. * Min temperature.....31-36. * Max humidity........65-80 percent. * Humidity recovery...Good. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds up to 5 mph in the evening becoming drainage winds less than 5 mph. * Ridges/upr slopes....Northwest winds 2 to 7 mph in the evening becoming light winds less than 5 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....Northwest 5 to 10 mph. * Ventilation Index...Moderate (242-342) decreasing to low (25-32) after midnight. .TUESDAY... * Sky/weather.........Mostly sunny then becoming partly cloudy. * Max temperature.....62-67...except 56-62 ridges. * Min humidity........25-35 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph. * Ridges/upr slopes....light less than 5 mph becoming west 2 to 5 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......10000 ft agl. * Transport winds.....West 5 to 10 mph. * Ventilation Index...Low (71-131) increasing to high to very high (669-809) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 36 to 41. Highs 60 to 69. Northwest winds up to 5 mph. .THURSDAY...Mostly clear. Lows 38 to 43. Highs 64 to 72. North winds 1 to 6 mph. .FRIDAY...Mostly clear. Lows 40 to 45. Highs 66 to 74. Northwest winds 1 to 6 mph. .SATURDAY...Mostly clear. Lows 41 to 46. Highs 68 to 76. West winds 1 to 6 mph. .SUNDAY...Mostly clear. Lows 40 to 45. Highs 67 to 75. West winds 2 to 7 mph. $$ ORZ696-182315- John Day Valley- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Partly cloudy then becoming mostly sunny. * Max temperature.....59-67...except 55-60 ridges. * Min humidity........19-26 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming northwest 2 to 7 mph in the afternoon. * Ridges/upr slopes....Northwest winds 2 to 7 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......10000 ft agl. * Transport winds.....Northwest 5 to 10 mph. * Ventilation Index...Low (73-119) increasing to high to very high (665-881) in the afternoon. .TONIGHT... * Sky/weather.........Mostly clear. * Min temperature.....34-39. * Max humidity........64-77 percent. * Humidity recovery...Good...except Moderate ridges. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds 1 to 6 mph in the evening becoming drainage winds less than 5 mph. * Ridges/upr slopes....North winds 2 to 7 mph in the evening becoming light winds less than 5 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....Northwest 5 to 10 mph. * Ventilation Index...Moderate (328-416) decreasing to low (25) after midnight. .TUESDAY... * Sky/weather.........Mostly sunny. * Max temperature.....64-72...except 60-65 ridges. * Min humidity........20-26 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming northwest 2 to 6 mph in the afternoon. * Ridges/upr slopes....light less than 5 mph becoming northwest 2 to 6 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......8500 ft agl. * Transport winds.....West 5 to 10 mph. * Ventilation Index...Low (44-86) increasing to high to very high (609-713) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 39 to 44. Highs 66 to 75. Northwest winds 1 to 6 mph. .THURSDAY...Mostly clear. Lows 41 to 46. Highs 70 to 78. North winds 1 to 6 mph. .FRIDAY...Mostly clear. Lows 42 to 47. Highs 72 to 80. Northwest winds 1 to 6 mph. .SATURDAY...Mostly clear. Lows 43 to 48. Highs 73 to 82. West winds 1 to 6 mph. .SUNDAY...Mostly clear. Lows 42 to 47. Highs 73 to 81. West winds 2 to 7 mph. $$ ORZ700-182315- Central Mountains of Oregon- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Mostly cloudy then becoming partly cloudy. * Max temperature.....61-68...except 54-59 ridges. * Min humidity........14-22 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming northwest 3 to 8 mph in the afternoon. * Ridges/upr slopes....light less than 5 mph becoming northwest 2 to 7 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......10500 ft agl. * Transport winds.....Northwest 5 to 10 mph. * Ventilation Index...Low (49-121) increasing to high to very high (642-868) in the afternoon. .TONIGHT... * Sky/weather.........Mostly clear. * Min temperature.....30-37. * Max humidity........66-79 percent. * Humidity recovery...Good. * 20-foot winds....... * Valleys/lwr slopes...North winds 4 to 9 mph in the evening becoming drainage winds less than 5 mph. * Ridges/upr slopes....North winds 2 to 7 mph in the evening becoming light winds less than 5 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....North around 15 mph becoming northwest around 5 mph after midnight. * Ventilation Index...Moderate to high (426-584) decreasing to low (25-29) after midnight. .TUESDAY... * Sky/weather.........Partly cloudy then becoming mostly sunny. * Max temperature.....66-73...except 59-64 ridges. * Min humidity........16-24 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming northwest 1 to 6 mph in the afternoon. * Ridges/upr slopes....light less than 5 mph becoming northwest 2 to 5 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......9000 ft agl. * Transport winds.....West 5 to 10 mph. * Ventilation Index...Low (47-89) increasing to high to very high (578-734) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 35 to 42. Highs 68 to 75. Northwest winds 3 to 8 mph. .THURSDAY...Mostly clear. Lows 38 to 45. Highs 72 to 79. North winds 3 to 8 mph. .FRIDAY...Mostly clear. Lows 39 to 46. Highs 73 to 80. Northwest winds 3 to 8 mph. .SATURDAY...Mostly clear. Lows 40 to 46. Highs 75 to 81. West winds 3 to 8 mph. .SUNDAY...Mostly clear. Lows 39 to 45. Highs 74 to 80. West winds 3 to 8 mph. $$ ORZ703-182315- Warm Springs Reservation- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Mostly cloudy then becoming mostly sunny. * Max temperature.....62-71...except 50-60 ridges. * Min humidity........20-30 percent...except 31-46 percent ridges. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming northwest 4 to 10 mph in the afternoon. * Ridges/upr slopes....Northwest winds 4 to 9 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......9500 ft agl. * Transport winds.....West around 10 mph. * Ventilation Index...Low (65-115) increasing to high to very high (522-752) in the afternoon. .TONIGHT... * Sky/weather.........Mostly clear. * Min temperature.....34-39. * Max humidity........71-86 percent. * Humidity recovery...Good. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds 6 to 12 mph shifting to the west 2 to 5 mph after midnight. * Ridges/upr slopes....West winds 4 to 9 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....West 10 to 15 mph. * Ventilation Index...Moderate (257-473) decreasing to low (27-43) after midnight. .TUESDAY... * Sky/weather.........Partly cloudy. * Max temperature.....67-76...except 55-64 ridges. * Min humidity........23-33 percent...except 33-48 percent ridges. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming northwest 2 to 7 mph in the afternoon. * Ridges/upr slopes....light less than 5 mph becoming northwest 4 to 9 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......7500 ft agl. * Transport winds.....West 10 to 15 mph. * Ventilation Index...Low (69-117) increasing to high (552-686) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 39 to 44. Highs 66 to 77. Northwest winds 5 to 11 mph. .THURSDAY...Mostly clear. Lows 42 to 47. Highs 70 to 82. Northwest winds 3 to 8 mph. .FRIDAY...Mostly clear. Lows 44 to 49. Highs 70 to 82. West winds 5 to 11 mph. .SATURDAY...Mostly clear. Lows 43 to 48. Highs 69 to 82. West winds 5 to 11 mph. .SUNDAY...Mostly clear. Lows 42 to 47. Highs 68 to 81. West winds 5 to 11 mph. $$ ORZ704-182315- Northern Deschutes National Forest- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Mostly cloudy then becoming mostly sunny. * Max temperature.....62-67...except 49-60 ridges. * Min humidity........22-27 percent...except 29-44 percent ridges. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming northwest 1 to 6 mph in the afternoon. * Ridges/upr slopes....Northwest winds 3 to 8 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......9500 ft agl. * Transport winds.....Northwest 5 to 10 mph. * Ventilation Index...Low (71-111) increasing to high (509-635) in the afternoon. .TONIGHT... * Sky/weather.........Mostly clear. * Min temperature.....29-35. * Max humidity........69-84 percent. * Humidity recovery...Good. * 20-foot winds....... * Valleys/lwr slopes...Northwest winds 1 to 6 mph in the evening becoming drainage winds less than 5 mph. * Ridges/upr slopes....Northwest winds 3 to 8 mph in the evening becoming light winds less than 5 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....West 5 to 10 mph. * Ventilation Index...Moderate (248-328) decreasing to low (25-27) after midnight. .TUESDAY... * Sky/weather.........Partly cloudy. * Max temperature.....68-73...except 54-65 ridges. * Min humidity........24-29 percent...except 31-46 percent ridges. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph. * Ridges/upr slopes....light less than 5 mph becoming northwest 2 to 7 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......7500 ft agl. * Transport winds.....West 5 to 10 mph. * Ventilation Index...Low (66-96) increasing to high (530-664) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Mostly clear. Lows 35 to 40. Highs 62 to 75. Northwest winds 3 to 8 mph. .THURSDAY...Mostly clear. Lows 38 to 44. Highs 65 to 78. North winds 1 to 6 mph. .FRIDAY...Mostly clear. Lows 39 to 44. Highs 65 to 79. Northwest winds 1 to 6 mph. .SATURDAY...Mostly clear. Lows 39 to 44. Highs 65 to 78. West winds 3 to 8 mph. .SUNDAY...Mostly clear. Lows 38 to 43. Highs 64 to 77. West winds 4 to 9 mph. $$ ORZ705-182315- Southern Deschutes National Forest- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Mostly cloudy then becoming partly cloudy. * Max temperature.....59-64...except 49-57 ridges. * Min humidity........14-28 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming northwest 1 to 5 mph in the afternoon. * Ridges/upr slopes....light less than 5 mph becoming northwest 2 to 7 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......11000 ft agl. * Transport winds.....Northwest 5 to 10 mph. * Ventilation Index...Low (62-118) increasing to high to very high (552-738) in the afternoon. .TONIGHT... * Sky/weather.........Partly cloudy. * Min temperature.....28-33. * Max humidity........74-89 percent. * Humidity recovery...Excellent...except Good ridges. * 20-foot winds....... * Valleys/lwr slopes...North winds 1 to 6 mph in the evening becoming drainage winds less than 5 mph. * Ridges/upr slopes....Northwest winds 2 to 7 mph in the evening becoming light winds less than 5 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....North 5 to 10 mph. * Ventilation Index...Moderate to high (270-552) decreasing to low (25-32) after midnight. .TUESDAY... * Sky/weather.........Mostly sunny. * Max temperature.....65-71...except 55-64 ridges. * Min humidity........19-27 percent...except 23-38 percent ridges. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph. * Ridges/upr slopes....light less than 5 mph becoming northwest 1 to 6 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......9000 ft agl. * Transport winds.....West 5 to 10 mph. * Ventilation Index...Low (49-85) increasing to high to very high (546-706) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Mostly clear. Lows 33 to 38. Highs 65 to 75. Northwest winds 1 to 6 mph. .THURSDAY...Mostly clear. Lows 36 to 41. Highs 68 to 78. North winds 1 to 6 mph. .FRIDAY...Mostly clear. Lows 37 to 42. Highs 69 to 79. Northwest winds 1 to 6 mph. .SATURDAY...Mostly clear. Lows 37 to 42. Highs 68 to 79. West winds 1 to 6 mph. .SUNDAY...Mostly clear. Lows 36 to 41. Highs 68 to 78. West winds 1 to 6 mph. $$ ORZ697-182315- Central Blue Mountains- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Partly cloudy. * Max temperature.....56-61...except 50-56 ridges. * Min humidity........21-28 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming northwest 3 to 6 mph in the afternoon. * Ridges/upr slopes....Northwest winds 3 to 8 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......10000 ft agl. * Transport winds.....North around 15 mph. * Ventilation Index...Low to moderate (149-301) increasing to very high (898-1030) in the afternoon. .TONIGHT... * Sky/weather.........Partly cloudy. * Min temperature.....29-34. * Max humidity........60-73 percent. * Humidity recovery...Good...except Moderate ridges. * 20-foot winds....... * Valleys/lwr slopes...North winds 1 to 6 mph in the evening becoming drainage winds less than 5 mph. * Ridges/upr slopes....North winds 2 to 7 mph in the evening becoming light winds less than 5 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....North 5 to 10 mph. * Ventilation Index...Moderate (345-409) decreasing to low (25-32) after midnight. .TUESDAY... * Sky/weather.........Mostly sunny then becoming partly cloudy. * Max temperature.....62-67...except 56-62 ridges. * Min humidity........21-26 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph. * Ridges/upr slopes....light less than 5 mph becoming northwest 2 to 6 mph in the afternoon. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......10500 ft agl. * Transport winds.....West around 10 mph. * Ventilation Index...Low (90-172) increasing to very high (751-931) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 35 to 40. Highs 62 to 69. Northwest winds 1 to 6 mph. .THURSDAY...Mostly clear. Lows 37 to 42. Highs 65 to 72. North winds 1 to 6 mph. .FRIDAY...Mostly clear. Lows 39 to 44. Highs 67 to 74. Northwest winds 1 to 6 mph. .SATURDAY...Mostly clear. Lows 40 to 45. Highs 70 to 76. West winds 2 to 7 mph. .SUNDAY...Mostly clear. Lows 39 to 44. Highs 70 to 76. West winds 2 to 7 mph. $$ ORZ698-182315- Southern Blue Mountains- 634 AM PDT Mon May 18 2026 .TODAY... * Sky/weather.........Partly cloudy. * Max temperature.....57-63. * Min humidity........16-21 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph becoming northwest 3 to 7 mph in the afternoon. * Ridges/upr slopes....Northwest winds 1 to 6 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......11000 ft agl. * Transport winds.....North around 15 mph. * Ventilation Index...Low to moderate (188-268) increasing to very high (979-1050) in the afternoon. .TONIGHT... * Sky/weather.........Partly cloudy. * Min temperature.....29-34. * Max humidity........61-72 percent. * Humidity recovery...Good. * 20-foot winds....... * Valleys/lwr slopes...North winds 1 to 6 mph in the evening becoming drainage winds less than 5 mph. * Ridges/upr slopes....North winds 1 to 6 mph in the evening becoming light winds less than 5 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......500 ft agl. * Transport winds.....North around 10 mph. * Ventilation Index...Moderate (395-495) decreasing to low (28-34) after midnight. .TUESDAY... * Sky/weather.........Mostly sunny then becoming partly cloudy. * Max temperature.....63-69. * Min humidity........15-20 percent. * 20-foot winds....... * Valleys/lwr slopes...Upslope less than 5 mph. * Ridges/upr slopes....light less than 5 mph. * CWR.................0 percent. * Chc of lightning....0 percent. * Mixing height.......10500 ft agl. * Transport winds.....Northwest 5 to 10 mph. * Ventilation Index...Low (73-141) increasing to very high (830-956) in the afternoon. .Forecast days 3 through 7...... .WEDNESDAY...Partly cloudy. Lows 34 to 40. Highs 67 to 73. Northwest winds up to 5 mph. .THURSDAY...Mostly clear. Lows 37 to 42. Highs 70 to 76. North winds 3 to 8 mph. .FRIDAY...Mostly clear. Lows 38 to 44. Highs 72 to 78. Northwest winds 2 to 7 mph. .SATURDAY...Mostly clear. Lows 39 to 45. Highs 74 to 80. West winds 2 to 7 mph. .SUNDAY...Mostly clear. Lows 39 to 45. Highs 74 to 80. West winds 3 to 8 mph. $$ .8-14 DAY OUTLOOK for Monday May 25 through Sunday May 31... A greater chance of warmer and drier than normal. $$