FNUS55 KTWC 192116 FWFTWC Fire Weather Planning Forecast for Southeast Arizona National Weather Service Tucson AZ 216 PM MST Tue May 19 2026 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 20-FOOT WIND FORECAST OF 'LIGHT WINDS' INDICATES MAINLY TERRAIN DRIVEN WINDS +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ .DISCUSSION...Dry and breezy conditions through Wednesday resulting in elevated fire weather conditions for areas east and south of Tucson with brief near critical conditions existing in the southeastern portion of Cochise County. For Thursday through Sunday, winds will be generally be less than 15 mph with min relative humidities sitting in the teens to the mid-20s. Mid to upper level moisture will approach as early as this weekend south and east of Tucson, but the more impactful moisture will likely hold off until early next week as another weather system approaches. THere is a 10 to 30 percent chance of showers and thunderstorms Monday for much of southeast Arizona, and these chances will trend towards the NM border Tuesday. AZZ150-201415- Arizona Fire Weather Zone 150 Sonoran FDRA-Most of Pima County-South Central Pinal County- Tohono O'odham Nation-Tucson Metropolitan area-TDC- 216 PM MST Tue May 19 2026 .TONIGHT... * Sky/Weather..............Mostly cloudy (50-60 pct) then becoming partly cloudy (40-50 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........56 to 66 degs. 24 hr Trend...........Up 2 to 5 degs. * Max Humidity.............34 to 44 pct. 24 hr Trend...........Down 10 to 14 pct. * Wind (20 ft/10-min avg)..West around 15 mph in the evening becoming light. * 10000 ft MSL Wind........Southwest 20 to 25 mph. .WEDNESDAY... * Sky/Weather..............Partly cloudy (40-50 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........84 to 94 degs. 24 hr Trend...........Up 1 deg. * Min Humidity.............7 to 15 pct. 24 hr Trend...........Down 3 to 7 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 15 to 20 mph. * Mixing height............11971 ft AGL. * Transport winds..........South 10 to 15 knots. * Ventilation Category.....Excellent (179565 knot-ft). .WEDNESDAY NIGHT... * Sky/Weather..............Partly cloudy (35-45 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........55 to 65 degs. 24 hr Trend...........Little change. * Max Humidity.............26 to 36 pct. 24 hr Trend...........Down 5 to 9 pct. * Wind (20 ft/10-min avg)..Southwest around 15 mph shifting to the south after midnight. * 10000 ft MSL Wind........South 10 to 15 mph. .THURSDAY... * Sky/Weather..............Sunny (0-10 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........86 to 96 degs. 24 hr Trend...........Up 2 to 5 degs. * Min Humidity.............7 to 14 pct. 24 hr Trend...........Down 1 pct. * Wind (20 ft/10-min avg)..Light winds becoming southwest around 10 mph in the afternoon. * 10000 ft MSL Wind........South 10 to 15 mph. * Mixing height............14271 ft AGL. * Transport winds..........South 8 to 11 knots. * Ventilation Category.....Excellent (156981 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .FRIDAY...Clear. Lows 57 to 67. Highs 86 to 96. South wind around 15 mph. Minimum Humidity 8 to 16 pct. .SATURDAY...Clear. Lows 58 to 68. Highs 87 to 97. Southwest wind around 15 mph. Minimum Humidity 12 to 20 pct. .SUNDAY...Clear. Lows 59 to 69. Highs 89 to 99. Southwest wind around 15 mph. Minimum Humidity 12 to 20 pct. .MEMORIAL DAY...Mostly clear. Lows 61 to 71. Highs 90 to 100. .TUESDAY...Mostly clear. Lows 60 to 70. Highs 88 to 98. NOTE TO USERS - ZONE 150 VENTILATION CATEGORY...MIXING HEIGHT AND TRANSPORT WINDS ARE BASED ON THE TUCSON INTERNATIONAL AIRPORT LOCATION (2550 MSL) $$ AZZ151-201415- Arizona Fire Weather Zone 151 Western half Desert Grasslands FDRA including elevations up to 5500 feet in Southeast corner of Pinal County- Extreme Eastern Pima County-Western third of Cochise County- Santa Cruz County-TDC- 216 PM MST Tue May 19 2026 .TONIGHT... * Sky/Weather..............Mostly cloudy (50-60 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........51 to 61 degs. 24 hr Trend...........Up 3 to 6 degs. * Max Humidity.............34 to 44 pct. 24 hr Trend...........Down 13 to 17 pct. * Wind (20 ft/10-min avg)..Southwest around 15 mph in the evening becoming light. * 10000 ft MSL Wind........Southwest 25 to 30 mph. .WEDNESDAY... * Sky/Weather..............Mostly cloudy (45-55 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........79 to 89 degs. 24 hr Trend...........Little change. * Min Humidity.............8 to 15 pct. 24 hr Trend...........Down 3 to 7 pct. * Wind (20 ft/10-min avg)..South 10 to 15 mph. * 10000 ft MSL Wind........Southwest 20 to 25 mph. * Mixing height............9059 ft AGL. * Transport winds..........South 16 to 20 knots. * Ventilation Category.....Excellent (181180 knot-ft). .WEDNESDAY NIGHT... * Sky/Weather..............Mostly cloudy (50-60 pct) then becoming partly cloudy (30-40 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........50 to 60 degs. 24 hr Trend...........Down 1 deg. * Max Humidity.............32 to 42 pct. 24 hr Trend...........Up 5 to 9 pct. * Wind (20 ft/10-min avg)..West around 15 mph shifting to the south after midnight. * 10000 ft MSL Wind........Southwest 15 to 20 mph. .THURSDAY... * Sky/Weather..............Mostly sunny (5-15 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........80 to 90 degs. 24 hr Trend...........Down 1 to 4 degs. * Min Humidity.............9 to 18 pct. 24 hr Trend...........Up 1 pct. * Wind (20 ft/10-min avg)..South around 10 mph shifting to the southwest in the afternoon. * 10000 ft MSL Wind........Southwest 10 to 15 mph. * Mixing height............11591 ft AGL. * Transport winds..........South 12 to 15 knots. * Ventilation Category.....Excellent (173865 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .FRIDAY...Mostly clear. Lows 51 to 61. Highs 80 to 90. Southwest wind around 15 mph. Minimum Humidity 10 to 18 pct. .SATURDAY...Mostly clear. Lows 52 to 62. Highs 81 to 91. Southwest wind around 15 mph. Minimum Humidity 14 to 24 pct. .SUNDAY...Mostly clear. Lows 53 to 63. Highs 84 to 94. Light winds. Minimum Humidity 13 to 23 pct. .MEMORIAL DAY...Partly cloudy. Slight chance of showers and thunderstorms. Lows 55 to 65. Highs 84 to 94. .TUESDAY...Mostly clear. Lows 54 to 64. Highs 83 to 93. NOTE TO USERS - ZONE 151 VENTILATION CATEGORY...MIXING HEIGHT AND TRANSPORT WINDS ARE BASED ON THE BUENOS AIRES N.W.R. LOCATION (3500 MSL) $$ AZZ152-201415- Arizona Fire Weather Zone 152 Eastern half Desert Grasslands FDRA including elevations up to 5500 feet in Southwest Graham County and Eastern two thirds of Cochise County-Southern San Carlos Reservation- Southern Greenlee County below 5000 feet-TDC- 216 PM MST Tue May 19 2026 .TONIGHT... * Sky/Weather..............Mostly cloudy (45-55 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........52 to 62 degs. 24 hr Trend...........Up 3 to 6 degs. * Max Humidity.............27 to 37 pct. 24 hr Trend...........Down 13 to 17 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 25 to 30 mph. .WEDNESDAY... * Sky/Weather..............Mostly cloudy (50-60 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........80 to 90 degs. 24 hr Trend...........Down 1 deg. * Min Humidity.............7 to 15 pct. 24 hr Trend...........Down 1 to 4 pct. * Wind (20 ft/10-min avg)..South 10 to 15 mph. * 10000 ft MSL Wind........Southwest 20 to 25 mph. * Mixing height............11533 ft AGL. * Transport winds..........South 16 to 21 knots. * Ventilation Category.....Excellent (242193 knot-ft). .WEDNESDAY NIGHT... * Sky/Weather..............Mostly cloudy (50-60 pct) then becoming partly cloudy (40-50 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........50 to 60 degs. 24 hr Trend...........Down 1 to 4 degs. * Max Humidity.............31 to 41 pct. 24 hr Trend...........Down 3 to 6 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 15 to 20 mph. .THURSDAY... * Sky/Weather..............Partly cloudy (40-50 pct) then becoming mostly sunny (5-15 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........80 to 90 degs. 24 hr Trend...........Down 1 deg. * Min Humidity.............7 to 17 pct. 24 hr Trend...........Up 3 to 7 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 10 to 15 mph. * Mixing height............12788 ft AGL. * Transport winds..........Southwest 13 to 17 knots. * Ventilation Category.....Excellent (217396 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .FRIDAY...Mostly clear. Lows 51 to 61. Highs 80 to 90. Southwest wind around 15 mph. Minimum Humidity 7 to 17 pct. .SATURDAY...Mostly clear. Lows 52 to 62. Highs 81 to 91. West wind around 15 mph. Minimum Humidity 11 to 21 pct. .SUNDAY...Mostly clear. Lows 53 to 63. Highs 84 to 94. Light winds. Minimum Humidity 11 to 21 pct. .MEMORIAL DAY...Partly cloudy. Slight chance of showers and thunderstorms. Lows 56 to 66. Highs 84 to 94. .TUESDAY...Mostly clear. Slight chance of showers and thunderstorms. Lows 54 to 64. Highs 82 to 92. NOTE TO USERS - ZONE 152 VENTILATION CATEGORY...MIXING HEIGHT AND TRANSPORT WINDS ARE BASED ON THE CHIRICAHUA N.M. LOCATION (5400 MSL) $$ AZZ153-201415- Arizona Fire Weather Zone 153 Northern Graham County-Northern Greenlee County- White and Gila Mountains-Apache Sitgreaves NF- Southern San Carlos Reservation above 5000 feet-SDC- 216 PM MST Tue May 19 2026 .TONIGHT... * Sky/Weather..............Partly cloudy (40-50 pct) then becoming mostly cloudy (50-60 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........46 to 56 degs. 24 hr Trend...........Up 3 to 7 degs. * Max Humidity.............37 to 47 pct. 24 hr Trend...........Down 15 to 19 pct. * Wind (20 ft/10-min avg)..West around 15 mph in the evening becoming light. * 10000 ft MSL Wind........Southwest 20 to 25 mph. .WEDNESDAY... * Sky/Weather..............Mostly cloudy (50-60 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........68 to 78 degs. 24 hr Trend...........Little change. * Min Humidity.............7 to 15 pct. 24 hr Trend...........Down 3 to 7 pct. * Wind (20 ft/10-min avg)..South 10 to 15 mph. * 10000 ft MSL Wind........Southwest 15 to 20 mph. * Mixing height............10027 ft AGL. * Transport winds..........South 17 to 19 knots. * Ventilation Category.....Excellent (190513 knot-ft). .WEDNESDAY NIGHT... * Sky/Weather..............Mostly cloudy (50-60 pct) then becoming partly cloudy (40-50 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........44 to 54 degs. 24 hr Trend...........Down 1 to 4 degs. * Max Humidity.............30 to 40 pct. 24 hr Trend...........Down 4 to 8 pct. * Wind (20 ft/10-min avg)..West around 15 mph shifting to the north after midnight. * 10000 ft MSL Wind........Southwest 15 to 20 mph. .THURSDAY... * Sky/Weather..............Mostly sunny (20-30 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........70 to 80 degs. 24 hr Trend...........Little change. * Min Humidity.............8 to 15 pct. 24 hr Trend...........Up 1 pct. * Wind (20 ft/10-min avg)..Light winds becoming southwest around 15 mph in the afternoon. * 10000 ft MSL Wind........Southwest 10 to 15 mph. * Mixing height............11246 ft AGL. * Transport winds..........West 13 to 15 knots. * Ventilation Category.....Excellent (168690 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .FRIDAY...Mostly clear. Lows 44 to 54. Highs 71 to 81. Light winds. Minimum Humidity 8 to 15 pct. .SATURDAY...Mostly clear. Lows 45 to 55. Highs 73 to 83. Light winds. Minimum Humidity 11 to 18 pct. .SUNDAY...Mostly clear. Lows 47 to 57. Highs 76 to 86. Light winds. Minimum Humidity 11 to 19 pct. .MEMORIAL DAY...Partly cloudy. Chance of showers and slight chance of thunderstorms. Lows 49 to 59. Highs 75 to 85. .TUESDAY...Partly cloudy. Slight chance of showers and thunderstorms. Lows 48 to 58. Highs 73 to 83. NOTE TO USERS - ZONE 153 VENTILATION CATEGORY...MIXING HEIGHT AND TRANSPORT WINDS ARE BASED ON THE POINT OF PINES LOCATION (6040 MSL) $$ AZZ154-201415- Arizona Fire Weather Zone 154 Forest Woodlands FDRA including the Sky Islands of Southeast Arizona above 5500 feet-Coronado NF-TDC- 216 PM MST Tue May 19 2026 .TONIGHT... * Sky/Weather..............Mostly cloudy (50-60 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........48 to 58 degs. 24 hr Trend...........Up 2 to 5 degs. * Max Humidity.............26 to 36 pct. 24 hr Trend...........Down 13 to 17 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 25 to 30 mph. .WEDNESDAY... * Sky/Weather..............Mostly cloudy (55-65 pct) then becoming partly cloudy (45-55 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........70 to 80 degs. 24 hr Trend...........Down 1 deg. * Min Humidity.............8 to 18 pct. 24 hr Trend...........Up 1 to 4 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 20 to 25 mph. * Mixing height............12078 ft AGL. * Transport winds..........Southwest 17 to 21 knots. * Ventilation Category.....Excellent (229482 knot-ft). .WEDNESDAY NIGHT... * Sky/Weather..............Mostly cloudy (50-60 pct) then becoming partly cloudy (40-50 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........48 to 58 degs. 24 hr Trend...........Little change. * Max Humidity.............30 to 40 pct. 24 hr Trend...........Down 4 to 8 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 15 to 20 mph. .THURSDAY... * Sky/Weather..............Partly cloudy (30-40 pct) then becoming mostly sunny (5-15 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........70 to 80 degs. 24 hr Trend...........Little change. * Min Humidity.............12 to 22 pct. 24 hr Trend...........Up 3 to 6 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 15 to 20 mph. * Mixing height............13792 ft AGL. * Transport winds..........Southwest 15 to 18 knots. * Ventilation Category.....Excellent (227568 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .FRIDAY...Mostly clear. Lows 48 to 58. Highs 70 to 80. Southwest wind around 15 mph. Minimum Humidity 11 to 21 pct. .SATURDAY...Mostly clear. Lows 49 to 59. Highs 72 to 82. Southwest wind around 15 mph. Minimum Humidity 16 to 26 pct. .SUNDAY...Mostly clear. Lows 50 to 60. Highs 75 to 85. Light winds. Minimum Humidity 16 to 26 pct. .MEMORIAL DAY...Partly cloudy. Slight chance of showers and thunderstorms. Lows 53 to 63. Highs 75 to 85. .TUESDAY...Mostly clear. Lows 51 to 61. Highs 73 to 83. NOTE TO USERS - ZONE 154 VENTILATION CATEGORY...MIXING HEIGHT AND TRANSPORT WINDS ARE BASED ON THE AVERAGE ACROSS THE ZONE $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson