Area Forecast Discussion
Issued by NWS Glasgow, MT
Issued by NWS Glasgow, MT
396 FXUS65 KGGW 200859 AFDGGW Area Forecast Discussion National Weather Service Glasgow MT 159 AM MST Thu Nov 20 2025 .DISCUSSION... KEY MESSAGES: - A small chance (20-50%) exists for fog along the Milk and Missouri River Valleys through mid-morning. - Mild temperatures continue through Monday. - Colder air moves in Monday night that is expected to linger through Thanksgiving. WEATHER PATTERN OVERVIEW: Low cloud cover with a clearing line looks to be set along the MT/ND border. These clouds should clear around or before mid0- morning. There is a low (20-50%) probability of fog developing again tonight along the Milk and Missouri River Valleys before dissipating around 8-10AM after sunup. After that, the upper level pattern over the western states will generally keep Montana under a ridge into the weekend. This maintains above normal temperatures and dry weather through the weekend. Models and ensembles are increasingly pointing toward a pattern change early next week with much colder temperatures. There are wide variations in precipitation potential in the models and ensembles at this time for next week. FORECAST CONFIDENCE & DEVIATIONS: No deviations from NBM were observed. There is HIGH confidence of temperatures dropping to near and below normal by Tuesday. There is MODERATE confidence of precipitation occurring next week, with low confidence on accumulations. There is LOW confidence of fog redeveloping this morning. GAH && .AVIATION... LAST UPDATE: 0800Z FLIGHT CAT RANGE: MVFR - VFR. DISCUSSION: A clearing line of MVFR clouds currently rides the MT/ND border. Most clouds look like they will clear out of KSDY before 10Z this morning. There is a small chance (20-50%) that river valley fog could develop and snake up the Missouri and Milk River Valleys and affect KOLF and maybe KGGW. Rough timing for fog looks to be around 10-15Z. A FEW mid level clouds may be possible through the rest of the cycle. WIND: Light and variable or South through the cycle. EQUIPMENT: KOLF`s ASOS telecomm circuit is down and can not be dialed into. Therefore, AMD NOT SKED for this TAF until repairs can be made. GAH && .GGW WATCHES/WARNINGS/ADVISORIES... None. && $$ weather.gov/glasgow