821 FNUS75 KTWC 171037 FWSTWC Spot Forecast for Harrington...AZ-SCA National Weather Service Tucson AZ 337 AM MST Wed Sep 17 2025 Forecast is based on forecast start time of 0600 MST on September 17. .DISCUSSION...Expect scattered shower and thunderstorms this afternoon evening and again on Thursday and Friday. Storms will be capable of heavy rainfall and wind gusts to 40 mph. Outside of storms wind speeds will be 4 to 8 mph. Min RH will be around 35 percent with very good overnight recoveries. .TODAY... Sky/weather.........Mostly cloudy. Chance of showers and thunderstorms in the afternoon and evening. Chance of pcpn......50 percent. Max temperature.....73-76 degrees. Min humidity........36-39 percent. 20-foot winds.......South southeast 4 to 8 mph in the morning, then shifting to the west early in the afternoon. Gusty and erratic winds expected near thunderstorms late in the morning. Mixing height.......1200 ft AGL increasing to 7400 ft AGL. Transport winds.....Northeast around 5 knots shifting to the south southwest 4 to 5 knots late in the morning. TIME (MST) 6 AM 9 AM NOON 3 PM Sky (%).........57 61 62 84 Weather cov..... CHANCE CHANCE Weather type....NONE NONE RNSHWR RNSHWR Tstm cov........ CHANCE CHANCE CWR.............0 0 40 50 Temp............50 65 72 70 RH..............85 54 41 42 20 FT wind......NE 2G6 S 2G6 S 3G7 NE 5G8 Mix hgt (ft)....400 2400 7400 4500 Transport wind..NE 5 SE 4 SW 5 SW 6 .TONIGHT... Sky/weather.........Mostly cloudy. Chance of showers and thunderstorms in the evening. Chance of pcpn......30 percent decreasing to 10 percent overnight. Min temperature.....49-52 degrees. Max humidity........86-89 percent. 20-foot winds.......South winds up to 5 mph shifting to the north. Gusty and erratic winds expected near thunderstorms early in the evening. Mixing height.......400 ft AGL. Transport winds.....East around 4 knots shifting to the northwest 6 to 8 knots. TIME (MST) 6 PM 9 PM MIDNGT 3 AM Sky (%).........62 75 67 51 Weather cov.....CHC Weather type....RNSHWR NONE NONE NONE Tstm cov........CHC CWR.............30 10 10 0 Temp............66 59 56 53 RH..............51 66 72 80 20 FT wind......S 6G9 N 2G6 NE 2G6 N 2G6 Mix hgt (ft)....1200 400 500 500 Transport wind..E 4 N 7 NW 6 NW 6 .THURSDAY... Sky/weather.........Mostly cloudy. Chance of showers and thunderstorms. Chance of pcpn......40 percent. Max temperature.....71-74 degrees. Min humidity........34-37 percent. 20-foot winds.......Northeast winds up to 4 to 8 mph shifting to the southwest in the late morning into afternoon. Gusty and erratic winds expected near thunderstorms. Mixing height.......900 ft AGL increasing to 5900 ft AGL. Transport winds.....North around 5 knots shifting to the east around 6 knots late in the afternoon. TIME (MST) 6 AM 9 AM NOON 3 PM Sky (%).........53 45 68 81 Weather cov..... CHANCE CHANCE Weather type....NONE NONE RNSHWR RNSHWR Tstm cov........ CHANCE CHANCE CWR.............10 10 40 40 Temp............50 65 71 71 RH..............86 53 37 37 20 FT wind......NE 2G6 E 2G7 SW 5G9 SW 5G9 Mix hgt (ft)....400 2400 5900 5000 Transport wind..N 5 NW 4 S 6 S 5 $$ Forecaster...HARDIN Requested by...Scott Pina Type of request...WILDFIRE .TAG 2521926.3/TWC .DELDT 09/17/25 .FormatterVersion 2.0.0 .EMAIL azphc@firenet.gov,guy.acuna@firenet.gov Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson