FNUS75 KGGW 181110 FWSGGW Spot Forecast for Billy Fire...USWFS National Weather Service Glasgow MT 510 AM MDT Mon May 18 2026 Forecast is based on forecast start time of 0600 MDT on May 18. If conditions become unrepresentative...contact the National Weather Service at (406) 228-9622. .DISCUSSION... There is a low end chance for isolated, light rain over the burn site this afternoon. North winds will remain steady before becoming light and variable just before sunrise tomorrow morning. Rising temperatures and lower humidities are expected through the end of the week. .TODAY... Sky/weather.........Cloudy (85-95 percent) then becoming mostly cloudy (75-85 percent). Slight chance of rain showers late in the afternoon. CWR.................6 percent. Chance of thunder...3 percent. Max temperature.....Around 46. Min humidity........49 percent. Wind (20 ft)........North winds 10 to 13 mph with gusts to around 21 mph. Mixing height.......5000 ft AGL. Transport winds.....North 16 to 20 mph. TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........93 92 97 91 85 83 69 73 86 85 78 71 Weather cov..... SCH Weather type.... RW Tstm cov........ CWR.............10 10 10 10 10 10 10 10 10 10 10 10 Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0 Temp............36 35 36 36 38 39 40 42 43 44 45 46 RH..............87 84 83 80 73 70 66 60 57 53 51 49 20 FT wind dir..NW NW NW N N N N N N N N N 20 FT wind spd..13 13 12 11 11 10 10 10 10 10 10 10 20 FT wind gust.21 21 20 18 18 17 17 18 18 18 18 18 Mix hgt (kft)...2.2 2.6 2.8 3.1 3.8 3.6 4.2 4.3 4.4 4.9 4.8 5.0 Transp wind dir.N N N N N N N N N N N N Transp wind spd.18 18 20 18 17 16 16 16 16 17 18 17 .TONIGHT... Sky/weather.........Mostly cloudy (55-65 percent) then becoming partly cloudy (25-35 percent). CWR.................1 percent. Chance of thunder...0 percent. Min temperature.....Around 31. Max humidity........83 percent. Wind (20 ft)........North winds 5 to 10 mph with gusts to around 18 mph in the evening becoming light. Mixing height.......300 ft AGL. Transport winds.....North 8 to 17 mph shifting to the northeast 6 to 7 mph late in the evening, then shifting to the southwest around 6 mph overnight. TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........60 63 49 43 31 24 13 11 13 6 10 13 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 0 Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0 Temp............46 45 44 41 39 37 36 34 33 33 32 31 RH..............49 49 56 63 70 75 78 80 83 83 83 82 20 FT wind dir..N N N N NE N NE W S S SW S 20 FT wind spd..10 9 7 6 5 3 3 3 3 3 3 3 20 FT wind gust.18 16 12 10 7 6 5 4 4 5 5 6 Mix hgt (kft)...5.2 4.9 2.9 1.2 0.8 0.5 0.5 0.4 0.4 0.3 0.3 0.3 Transp wind dir.N N N N N NE NE SW SW SW SW SW Transp wind spd.17 15 12 8 8 7 6 6 6 6 6 6 .TUESDAY... Sky/weather.........Mostly sunny (20-30 percent). CWR.................1 percent. Chance of thunder...2 percent. Max temperature.....Around 64. Min humidity........26 percent. Wind (20 ft)........Light winds becoming south around 6 mph in the late morning and afternoon. Mixing height.......9400 ft AGL. Transport winds.....Southwest 6 to 15 mph shifting to the west 14 to 15 mph late in the afternoon. TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........26 26 26 17 17 17 16 16 16 35 35 35 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 0 Chc of thdr (%).0 M M 0 0 0 0 0 0 0 0 0 Temp............33 36 41 47 50 53 56 58 60 62 62 63 RH..............81 70 60 49 43 37 33 30 28 26 25 25 20 FT wind dir..S S S S S S S S S SW SW SW 20 FT wind spd..4 4 4 6 6 6 6 6 6 6 6 6 20 FT wind gust.7 7 7 10 10 10 12 12 12 12 12 12 Mix hgt (kft)...0.3 0.8 1.5 2.6 4.1 5.5 6.7 7.2 7.9 9.3 9.4 9.1 Transp wind dir.S S S S SW SW SW SW W W W W Transp wind spd.6 8 8 9 10 12 13 15 15 15 15 14 $$ Forecaster...JACKSON Requested by...Sam Adams Type of request...WILDFIRE .TAG 2613837.2/GGW .DELDT 05/18/26 .FormatterVersion 2.0.0 .EMAIL samuel.adams2@usda.gov