FNUS75 KTWC 180809 FWSTWC Spot Forecast for Steeple Fire...USFS National Weather Service Tucson AZ 109 AM MST Mon May 18 2026 Forecast is based on forecast start time of 0600 MST on May 18. .DISCUSSION...Surface winds will be less than yesterday, however near critical fire weather conditions can be met for a few hours here and there today. Surface winds will be southwest at 15-20 mph with gusts up to 35 mph. Strongest winds will be along ridgetops and south/west facing slopes. Winds decrease in the early evening and remain under 10 mph overnight. Minimum RHs will range from 18-22% today with overnight recoveries ranging from 55-65%. .TODAY... Sky/weather.........Sunny. Chance of pcpn......0 percent. Max temperature.....55-58 degrees. Min humidity........24-27 percent. 20-foot winds.......Southwest winds 12 to 17 mph. Gusts up to 49 mph decreasing to 36 mph late in the morning. Smoke dispersal.....Marginal (9700 knot-ft) increasing to excellent (112100 knot-ft). Mixing height.......1900 ft AGL increasing to 5600 ft AGL. Transport winds.....Southwest 17 to 23 knots increasing to 24 to 29 knots in the late morning and afternoon. TIME (MST) 6 AM 9 AM NOON 3 PM Sky (%).........7 0 0 3 Weather cov..... Weather type....NONE NONE NONE NONE Tstm cov........ CWR.............0 0 0 0 Temp............41 49 54 56 RH..............43 32 27 25 20 FT wind......SW 16G37 SW 17G39 SW 13G29 SW 13G28 Mix hgt (ft)....600 3500 5200 5600 Transport wind..SW 17 SW 27 SW 28 SW 28 Vrate kt-ft/1K..10 96 146 158 Ventrate Cat....MRGL VYGD EXNT EXNT .TONIGHT... Sky/weather.........Mostly clear. Chance of pcpn......0 percent. Min temperature.....37-40 degrees. Max humidity........69-72 percent. 20-foot winds.......West winds 5 to 10 mph with gusts to around 29 mph. Smoke dispersal.....Very good (97100 knot-ft) decreasing to marginal (12700 knot-ft) early in the evening decreasing to poor (3000 knot-ft) late in the night. Mixing height.......2400 ft AGL decreasing to 500 ft AGL early in the evening. Transport winds.....West 14 to 23 knots decreasing to 6 to 13 knots in the late evening and overnight. TIME (MST) 6 PM 9 PM MIDNGT 3 AM Sky (%).........2 9 11 11 Weather cov..... Weather type....NONE NONE NONE NONE Tstm cov........ CWR.............0 0 0 0 Temp............52 45 42 39 RH..............31 47 57 65 20 FT wind......W 12G29 W 7G19 W 4G10 W 2G7 Mix hgt (ft)....4200 600 600 500 Transport wind..W 23 W 13 W 11 W 8 Vrate kt-ft/1K..97 8 6 4 Ventrate Cat....VYGD POOR POOR POOR .TUESDAY... Sky/weather.........Sunny. Chance of pcpn......0 percent. Max temperature.....60-63 degrees. Min humidity........20-23 percent. 20-foot winds.......West winds up to 5 mph shifting to the south 5 to 9 mph with gusts to around 22 mph. Smoke dispersal.....Poor (3300 knot-ft) increasing to excellent (132600 knot-ft). Mixing height.......2100 ft AGL increasing to 8700 ft AGL. Transport winds.....West around 6 knots increasing to southwest 18 to 20 knots. TIME (MST) 6 AM 9 AM NOON 3 PM Sky (%).........13 0 0 11 Weather cov..... Weather type....NONE NONE NONE NONE Tstm cov........ CWR.............0 0 0 0 Temp............40 54 59 61 RH..............64 36 27 21 20 FT wind......W 2G6 S 6G17 S 8G19 SW 10G22 Mix hgt (ft)....600 4000 7800 8500 Transport wind..W 6 S 13 SW 17 SW 19 Vrate kt-ft/1K..3 51 133 162 Ventrate Cat....POOR GOOD EXNT EXNT $$ Forecaster...TETRAULT Requested by...FMO Type of request...WILDFIRE .TAG 2613300.5/TWC .DELDT 05/18/26 .FormatterVersion 2.0.0 .EMAIL matthew.moe@usda.gov,azsdc@firenet.gov,kohl.pelts@usda.gov,Tedd.Hurtado@usda.gov Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson