Spot Forecast
Issued by NWS Great Falls, MT
Issued by NWS Great Falls, MT
741 FNUS75 KTFX 241200 FWSTFX Spot Forecast for American Bar Rx...USFS National Weather Service Great Falls MT 600 AM MDT Tue Sep 24 2024 Forecast is based on ignition time of 0700 MDT on September 24. If conditions become unrepresentative...contact the National Weather Service. .DISCUSSION... High pressure builds in today for well above normal temperatures, light breezes, and dry conditions. Overnight recovery will be moderate tonight followed by a breezy, hot day on Wednesday with critically low afternoon humidity. .REST OF TODAY... Sky/weather.........Sunny (5-15 percent). CWR.................0 percent. LAL.................1. Max temperature.....80-85. Min humidity........25-30 percent. Wind (20 ft)........ Slope/valley.......Southeast winds 5 to 15 mph. Mixing height.......4000 ft AGL. Transport winds.....South 10 to 15 mph. Haines Index........3 or very low potential for large plume dominated fire growth early in the morning. TIME (MDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........5 5 2 6 2 2 3 9 20 19 12 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 LAL.............1 1 1 1 1 1 1 1 1 1 1 Temp............47 50 54 61 66 69 73 77 80 81 82 RH..............84 81 69 58 49 43 39 35 32 30 30 20 FT wind dir..SE SE S S S S S S S SE SE 20 FT wind spd..5 5 10 10 10 10 10 10 10 10 5 20 FT wind gust.15 15 15 15 15 20 20 20 15 15 15 Mix hgt (kft)...1.0 1.0 1.5 2.0 2.5 3.0 3.0 3.0 3.5 4.0 3.5 Transp wind dir.S S S S S S S S S S S Transp wind spd.10 10 10 10 15 15 15 10 10 15 10 Haines index....M 3 3 3 3 3 3 3 3 3 3 .TONIGHT... Sky/weather.........Mostly clear (10-20 percent). CWR.................0 percent. LAL.................1. Min temperature.....49-54. Max humidity........55-65 percent. Wind (20 ft)........ Slope/valley.......Southeast winds 5 to 10 mph. Mixing height.......1000 ft AGL. Transport winds.....Southeast around 10 mph. TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........8 15 21 8 6 12 4 7 4 7 8 5 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 0 LAL.............1 1 1 1 1 1 1 1 1 1 1 1 Temp............80 77 73 67 65 63 60 59 57 57 55 54 RH..............31 36 40 45 50 52 56 58 62 64 64 64 20 FT wind dir..SE SE E SE SE SE SE SE SE SE SE SE 20 FT wind spd..5 5 5 5 5 5 10 10 10 10 10 10 20 FT wind gust.15 15 10 10 15 15 15 15 15 15 15 15 Mix hgt (kft)...2.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Transp wind dir.S SE SE SE SE SE SE SE SE SE SE SE Transp wind spd.10 10 10 10 10 10 10 10 10 10 10 10 Haines index....3 3 3 M M M M M M M M M .WEDNESDAY... Sky/weather.........Sunny (0-10 percent). CWR.................0 percent. LAL.................1. Max temperature.....86-91. Min humidity........14-19 percent. Wind (20 ft)........ Slope/valley.......South winds around 10 to 15 mph becoming southwest with gusts up to around 25 mph in the afternoon. Mixing height.......9500 ft AGL. Transport winds.....Southeast 10 to 15 mph becoming southwest and increasing 20 to 25 mph late in the afternoon. Haines Index........4 or low potential for large plume dominated fire growth. TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........4 6 5 1 3 3 3 3 3 8 8 8 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 0 LAL.............1 1 1 1 1 1 1 1 1 1 1 1 Temp............53 51 54 59 67 72 79 84 86 88 88 88 RH..............66 67 63 54 42 36 30 25 21 19 18 18 20 FT wind dir..SE SE SE S S S S S S SW SW SW 20 FT wind spd..10 10 10 10 10 10 10 10 10 10 10 10 20 FT wind gust.15 15 15 15 15 15 20 20 20 25 25 25 Mix hgt (kft)...1.0 1.0 1.0 1.0 2.0 2.5 3.5 6.0 8.5 9.5 7.5 4.5 Transp wind dir.SE SE SE SE S S S S SW SW SW SW Transp wind spd.10 15 10 15 15 15 15 20 25 25 25 25 Haines index....M M 4 4 4 4 4 4 4 4 4 4 $$ Forecaster...Greely Requested by...Will Menning Type of request...PRESCRIBED .TAG 2422941.0/TFX .DELDT 09/24/24 .FormatterVersion 2.0.0 .EMAIL william.menning@usda.gov, tfx.ops@nooa.gov