Spot Forecast
Issued by NWS Great Falls, MT
Issued by NWS Great Falls, MT
446 FNUS75 KTFX 231649 FWSTFX Spot Forecast for American Bar RX...USFS National Weather Service Great Falls MT 1049 AM MDT Mon Sep 23 2024 Forecast is based on ignition time of 0800 MDT on September 24. If conditions become unrepresentative...contact the National Weather Service. .DISCUSSION... Upper level ridging over the Pacific Northwest this morning will build eastward and over the Northern Rockies through the day on Tuesday, with the ridge axis shifting east of the region on Wednesday. This will lead to warming temperatures through Wednesday, with high temperatures on Tuesday approximately 10 degrees above normal rising to near 20 degrees above normal on Wednesday. Dry conditions are expected through the work week, with wind speeds across incident area remaining relatively light. .TUESDAY... Sky/weather.........Sunny (10-20 percent). CWR.................0 percent. Max temperature.....79-84. Min humidity........23-28 percent. Wind (20 ft)........ Slope/valley.......Southeast winds 5 to 10 mph, with afternoon gusts near 15 mph. Mixing height.......3500 ft AGL. Transport winds.....South 10 to 15 mph. Haines Index........3 or very low potential for large plume dominated fire growth. TIME (MDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........1 1 1 1 1 10 18 27 22 16 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 Temp............50 56 62 67 70 74 77 79 80 81 RH..............82 68 53 44 39 34 31 29 27 26 20 FT wind dir..SE SE SE SE SE SE SE SE SE SE 20 FT wind spd..10 10 10 10 10 10 10 10 10 10 20 FT wind gust.15 15 15 15 15 15 15 15 15 15 Mix hgt (kft)...1.0 1.0 2.0 2.5 2.5 3.0 3.5 3.5 3.0 2.5 Transp wind dir.SE S S S S S S S S S Transp wind spd.10 10 15 15 15 15 15 10 10 10 Haines index....3 3 3 3 3 3 3 3 3 3 .TUESDAY NIGHT... Sky/weather.........Mostly clear (0-10 percent). CWR.................0 percent. Min temperature.....48-53. Max humidity........67-72 percent. Wind (20 ft)........ Slope/valley.......Southeast winds 5 to 10 mph. Mixing height.......1000 ft AGL. Transport winds.....Southeast around 10 mph. Haines Index........ TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........11 8 6 3 3 2 2 2 3 3 3 3 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 0 Temp............79 75 70 65 62 60 59 57 55 54 53 52 RH..............28 33 40 46 50 52 55 58 61 64 67 70 20 FT wind dir..SE SE SE SE SE SE SE SE SE SE SE SE 20 FT wind spd..5 5 5 5 5 10 10 10 10 10 10 10 20 FT wind gust.15 15 10 10 10 15 15 15 15 15 15 15 Mix hgt (kft)...2.0 1.5 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Transp wind dir.S S SE SE SE S S S 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. Max temperature.....85-90. Min humidity........16-21 percent. Wind (20 ft)........ Slope/valley.......South winds 10 to 15 mph, with afternoon wind gusts near 20 mpg. Mixing height.......8500 ft AGL. Transport winds.....South 10 to 15 mph shifting to the southwest 15 to 20 mph late in the afternoon. Haines Index........4 or low potential for large plume dominated fire growth early in the morning. TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........3 3 3 1 1 1 4 4 4 11 11 11 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 0 Temp............51 53 56 60 65 71 76 80 83 85 86 86 RH..............73 68 63 56 47 38 30 25 22 21 19 19 20 FT wind dir..SE SE SE SE SE SE S S S S S S 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 20 20 20 Mix hgt (kft)...1.0 1.0 1.0 1.0 1.0 1.5 2.5 5.0 7.5 8.5 7.5 5.0 Transp wind dir.SE S S S S S S S S SW SW SW Transp wind spd.10 10 10 10 10 10 10 15 15 20 15 15 Haines index....M M 4 4 4 4 4 4 4 4 4 4 $$ Forecaster...Moldan Requested by...Lewis Tafelmeyer Type of request...PRESCRIBED .TAG 2422904.0/TFX .DELDT 09/23/24 .FormatterVersion 2.0.0 .EMAIL lewis.tafelmeyer@usda.gov, tfx.ops@noaa.gov