Area Forecast Discussion
Issued by NWS Glasgow, MT
Issued by NWS Glasgow, MT
925 FXUS65 KGGW 070811 AFDGGW Area Forecast Discussion National Weather Service Glasgow MT 211 AM MDT Mon Jul 7 2025 .DISCUSSION... KEY MESSAGES: 1) Upper ridge will build over the area today and Tuesday. 2) Hot weather will return Tuesday and Wednesday with highs in the 90s to near 100. 3) Cooler conditions to follow Thursday and Friday with gusty NW winds on Thursday. WEATHER PATTERN OVERVIEW: An upper trough moves to our east this morning allowing an upper ridge to build over the northern Rockies that will remain over the area until Wednesday. With W or SW flow, temperatures will warm with highs in the upper 80s and 90s Tuesday, 90s to low 100s Wednesday. This will be lower humidities that will be in the teens in most areas on Wednesday. At this point, west to SW winds will be less than 15 mph. Elevated fire weather conditions are possible with the low RH but more wind would be needed for critical fire weather conditions to occur. Heat impact levels are currently forecasted to high enough along and south of US Highway 2 that a Heat Advisory may be needed on Wednesday. An upper trough moves across the Canadian Prairies Wednesday night and Thursday which will bring a cold front through NE Montana Thursday morning with cooler temperatures. The system will bring a chance of showers and thunderstorms Wednesday night in all areas and possibly Thursday in some areas. Strong NW winds are possible Thursday with a Lake Wind Advisory possible on Fort Peck Lake. Another upper trough moves through the forecast area Thursday night and Friday with chances for showers and thunderstorms mainly Thursday night followed by cooler temperatures on Friday. Warmer temperatures return for the weekend as the upper trough moves to the east. FORECAST CONFIDENCE & DEVIATIONS: There is high confidence of temperatures reaching the 90s to near 100 for many locations by Wednesday. Low confidences on any showers and thunderstorm chances this week. No deviations from the NBM at this time. && .AVIATION... LAST UPDATED: 0800Z FLIGHT CAT RANGE: VFR. DISCUSSION: Mid and high clouds over NE Montana early this morning will clear by 15z in most areas and 18z around KGDV. Upper level ridge building into the area today will keep skies mostly clear this afternoon, tonight, and Tuesday. WINDS: Light and variable early becoming NW 5 to 15 knots this morning veering north this evening and to the east at 5 to 10 knots overnight. && .GGW WATCHES/WARNINGS/ADVISORIES... None. && $$ weather.gov/glasgow