FNUS76 KSTO 191206 FWSSTO Spot Forecast for Irish Rx...USFS National Weather Service Sacramento CA 506 AM PDT Tue May 19 2026 Forecast is based on ignition time of 0600 PDT on May 19. If conditions become unrepresentative...contact the National Weather Service. .DISCUSSION... Mostly sunny and dry conditions to persist over the burn site the next few days. Mostly light, terrain driven winds develop by Tuesday afternoon. East winds Tuesday morning around 10 mph sustained with gusts up to around 25 mph possible, then gradually shifting to the south and west in the afternoon. Similar pattern expected on Wednesday. Daytime humidity values will be in the low to mid teens on Tuesday, with upper teens to low 20s on Wednesday. Overnight recoveries forecast to be in the low to mid 30s. .TODAY... Sky/weather.........Sunny. Max temperature.....71-75. Min humidity........14-18 percent. Wind (20 ft)........ Slope/valley.......East winds up to 8 mph with gusts to around 21 mph shifting to the south up to 5 mph late in the morning, then shifting to the west up to 7 mph late in the morning increasing to 5 to 6 mph late in the afternoon. Ridgetop...........Southeast 3 to 5 mph shifting to the north late in the afternoon. Mixing height.......7500 ft AGL. Transport winds.....East 8 to 15 mph shifting to the southwest around 7 mph late in the morning, then shifting to the west 8 to 9 mph late in the afternoon. CWR.................1 percent. Chance of thunder...0 percent. TIME (PDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM Sky cover.......CLEAR CLEAR CLEAR CLEAR CLEAR CLEAR CWR.............0 0 0 0 0 0 Chc of thdr (%).0 0 0 0 0 0 Temp............51 57 67 71 71 73 RH..............22 23 16 17 21 20 SL/VL wind......E 8 E 6 S 5 W 6 W 7 W 6 SL/VL wind gust.21 15 10 14 17 15 Ridgetop wind...SE 5 SE 3 E 5 NE 5 N 3 N 3 Mix hgt (ft)....500 3700 3700 7500 7300 7300 Transport wind..E 15 E 8 E 8 SW 7 W 8 W 8 .TONIGHT... Sky/weather.........Clear. Min temperature.....52-56. Max humidity........32-36 percent. Wind (20 ft)........ Slope/valley.......Northwest winds up to 5 mph early in the evening becoming light, then becoming northeast up to 7 mph in the late evening and overnight. Ridgetop...........Northeast 6 to 7 mph shifting to the southwest around 3 mph after 3 am. Mixing height.......400 ft AGL. Transport winds.....Northwest around 9 mph shifting to the east 10 to 12 mph overnight. CWR.................1 percent. Chance of thunder...0 percent. TIME (PDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM Sky cover.......CLEAR CLEAR CLEAR CLEAR CLEAR CLEAR CWR.............0 0 0 0 0 0 Chc of thdr (%).0 0 0 0 0 0 Temp............71 62 58 57 56 55 RH..............21 32 34 31 28 26 SL/VL wind......W 5 NW 3 NE 5 NE 6 NE 7 NE 7 SL/VL wind gust.13 7 12 14 15 15 Ridgetop wind...N 6 NE 7 NE 7 E 6 S 2 SW 3 Mix hgt (ft)....4500 500 500 400 400 400 Transport wind..NW 9 N 6 N 6 E 10 E 12 E 12 .WEDNESDAY... Sky/weather.........Sunny. Max temperature.....75-79. Min humidity........17-21 percent. Wind (20 ft)........ Slope/valley.......East winds 5 to 6 mph early in the morning becoming light, then becoming west 5 to 7 mph late in the morning. Ridgetop...........West 1 to 3 mph shifting to the north around 0 mph late in the morning, then shifting to the south around 1 mph in the afternoon. Mixing height.......7200 ft AGL. Transport winds.....East around 10 mph shifting to the southwest 7 to 8 mph late in the morning. CWR.................0 percent. Chance of thunder...0 percent. TIME (PDT) 6 AM 10 AM 2 PM Sky cover.......MCLEAR MCLEAR MCLEAR CWR.............0 0 0 Chc of thdr (%).0 0 0 Temp............54 71 75 RH..............27 19 23 SL/VL wind......E 6G15 S 3G9 W 7G15 Ridgetop wind...W 3 N 0 S 1 Mix hgt (ft)....400 2800 7200 Transport wind..E 10 SE 5 SW 8 $$ Forecaster...EK Requested by...Sylvester Ruiz Type of request...PRESCRIBED .TAG 2613642.5/STO .DELDT 05/19/26 .FormatterVersion 2.0.0 .EMAIL sylvester.ruiz@usda.gov