991 FXUS65 KGGW 112022 AFDGGW Area Forecast Discussion National Weather Service Glasgow MT 222 PM MDT Mon Aug 11 2025 .DISCUSSION... KEY MESSAGES: - Winds and clouds decrease early this evening. A Lake Wind Advisory is in effect until 8 pm. - A warming trend into Wednesday will take place with highs Wednesday in the upper 80s and 90s. - A strong cold front will move through by Thursday morning, bringing in a cooler airmass Thursday. - There is a remote risk of a thunderstorm late Wednesday ahead of the strong cold front. WEATHER PATTERN OVERVIEW: The cumulus clouds this afternoon and northwest winds will diminish this evening as an upper trough over central Canada moves away and we also lose the daytime heating. Another trough will be dropping into western Canada Wednesday. This will push temperatures up Wednesday before a cold front marches through by Thursday morning. Models are indicating an increase in CAPE late Wednesday and felt to increase pops for the eastern zones as a strong to severe storm is possible with these CAPES of 1000-2000 and decent sheer with an upper low moving into the Prairie provinces. A zonal flow Thursday and Friday will keep the hot airmass to our south. But an upper ridge later in the week will build to our east, resulting in a southwest flow and could increase thunderstorm chances. FORECAST CONFIDENCE & DEVIATIONS: Mainly followed NBM but did blend other data for pops into the early evening. Also increase pops for Wednesday afternoon and evening with ingredients in place for possible thunderstorms. TFJ && .AVIATION... Updated: 1945z FLIGHT CATEGORY: VFR. Cumulus clouds this afternoon are expected to dissipate by evening. Northwest winds will also diminish. Mainly clear skies are expected Tuesday. Light and variable winds will begin increasing a bit from the South late in the day. TFJ && .GGW WATCHES/WARNINGS/ADVISORIES... Lake Wind Advisory until 8 PM MDT this evening for Central and Southeast Phillips-Central and Southern Valley-Garfield-McCone- Petroleum. && $$ weather.gov/glasgow