Spot Forecast
Issued by NWS Great Falls, MT
Issued by NWS Great Falls, MT
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924 FNUS75 KTFX 132319 FWSTFX Spot Forecast for Black Mountain...USFS National Weather Service Great Falls MT 519 PM MDT Tue Aug 13 2024 Forecast is based on forecast start time of 0600 MDT on August 14. If conditions become unrepresentative...contact the National Weather Service. .DISCUSSION... A light and shifting flow aloft will become weakly unstable during the afternoon hours through Thursday, causing a chance of showers and thunderstorms. There is a potential for erratic wind gusts to 40 mph and brief heavier rain showers. Temperatures will remain slightly below normal. Afternoon humidity will also remain above 25 percent with moderate overnight recovery. Outside of thunderstorms, winds should remain light. -Coulston .WEDNESDAY... Sky/weather.........Partly sunny (45-55 percent). Chance of rain showers through the day. Slight chance of thunderstorms in the afternoon. CWR.................15 percent decreasing to 5 percent in the afternoon. LAL.................1 until 1200, then 2. Max temperature.....65-70. Min humidity........33-38 percent. Wind (20 ft)........ Slope/valley.......West winds 5 to 10 mph. Gusts to 15 mph in the afternoon. Gusty and erratic winds expected near thunderstorms in the afternoon. Ridgetop...........Northwest 10 to 15 mph. Haines Index........2 or very low potential for large plume dominated fire growth early in the morning. TIME (MDT) 6 AM 9 AM NOON 3 PM Sky (%).........56 53 53 48 Weather cov.....S CHC CHANCE CHANCE S CHC Weather type....RNSHWR RNSHWR RNSHWR RNSHWR Tstm cov........ S CHC S CHC CWR.............20 20 10 10 LAL.............1 1 2 2 Temp............52 53 60 66 RH..............80 77 56 43 20 FT wind......W 5 W 5G10 W 5G15 W 5G15 Ridgetop wind...NW 15 NW 10 NW 10 NW 10 Haines index....M 2 2 2 .WEDNESDAY NIGHT... Sky/weather.........Partly cloudy (20-30 percent). CWR.................0 percent. LAL.................1. Min temperature.....52-57. Max humidity........53-58 percent. Wind (20 ft)........ Slope/valley.......Northwest winds around 5 mph shifting to downslope / down drainage 3 to 6 mph overnight. Ridgetop...........Northwest 5 mph becoming light and variable overnight. Haines Index........ TIME (MDT) 6 PM 9 PM MIDNGT 3 AM Sky (%).........30 25 25 24 Weather cov..... Weather type....NONE NONE NONE NONE Tstm cov........ CWR.............0 0 0 0 LAL.............1 1 1 1 Temp............67 61 57 55 RH..............38 50 58 58 20 FT wind......NW 5G15 NW 5 N 5 N 5 Ridgetop wind...W 5 NW 5 N 0 S 0 Haines index....2 M M M .THURSDAY... Sky/weather.........Sunny (10-20 percent) then becoming partly sunny (50-60 percent). Chance of rain showers and slight chance of thunderstorms in the afternoon. CWR.................5 percent. LAL.................1 until 1200, then 2. Max temperature.....70-75. Min humidity........28-33 percent. Wind (20 ft)........ Slope/valley.......Variable winds around 5 mph early in the morning becoming southeast 5 to 10 mph in the afternoon. Gusty and erratic winds expected near thunderstorms in the afternoon. Ridgetop...........Southeast around 5 mph. Haines Index........3 or very low potential for large plume dominated fire growth early in the morning. TIME (MDT) 6 AM 9 AM NOON 3 PM Sky (%).........26 5 53 53 Weather cov..... CHANCE CHANCE Weather type....NONE NONE RNSHWR RNSHWR Tstm cov........ S CHC S CHC CWR.............0 0 10 10 LAL.............1 1 2 2 Temp............54 58 68 72 RH..............58 54 40 33 20 FT wind......NE 5 E 0G5 SE 5G10 SE 5G10 Ridgetop wind...SE 5 SE 5 SE 5 S 5 Haines index....M 3 3 3 $$ Forecaster...Coulston Requested by...Jordan Bloxham Type of request...WILDFIRE .TAG 2419200.73/TFX .DELDT 08/13/24 .FormatterVersion 2.0.0 .EMAIL jbloxham@blm.gov, tfx.ops@noaa.gov