Area Forecast Discussion
Issued by NWS Glasgow, MT
Issued by NWS Glasgow, MT
835 FXUS65 KGGW 070604 AFDGGW Area Forecast Discussion National Weather Service Glasgow MT 1204 AM MDT Sun Jun 7 2026 Aviation Section Updated. .KEY MESSAGES... - A cold front will create a wide range in temperatures for highs today. - Strong to severe thunderstorms are possible late this afternoon and this evening. - A second wave of showers and thunderstorms is expected for Sunday along with cooler temperatures. && .DISCUSSION... WEATHER PATTERN OVERVIEW: Upper low moving into the Pacific Northwest and will gradually transition through the northern Rockies during the weekend. A broader trough will remain over northwest states through midweek with another wave lifting through the region. Toward the end of the week, an upper ridge begins building off the west coast, but effects of the broad trough will linger as it moves toward the Great Lakes. Beyond today, where hot temperatures are expected across the eastern zones, cool and somewhat wet weather is anticipated through the week. Atmosphere will become increasingly unstable today with the greatest instability near the North Dakota border where CAPE reaches around 2000 j/kg around 00z this evening. The best chances for severe weather today will be between 4 PM and midnight with large hail and damaging winds being the main threats. An upper wave lifts through the area Sunday afternoon and night with a secondary cold front moving across the area during the day. Lingering instability will bring chances for showers and thunderstorms with severe storms possible again mainly near the North Dakota border where temperatures will be much warmer than in the west. Winds increase behind the front, and in combination with possible thunderstorm gusts, have issued a Lake Wind Advisory for late afternoon and evening on Sunday. FORECAST CONFIDENCE & DEVIATIONS: Adjusted pops for today and included severe wording for the evening. Also adjusted winds for today as all the models are underforecasting the current wind speeds. Expect this to continue into the evening. && .AVIATION... FLIGHT CAT RANGE: VFR/MVFR Scattered shower and thunderstorm activity will continue through the overnight hours and even into Sunday, although storm coverage and intensity will decrease by around 07/09Z. Gusty west to northwesterly winds develop by Sunday afternoon with wind speeds mostly in the 20 to 35 kt range. VFR conditions generally prevail, but there will be scattered to broken low VFR/MVFR clouds Sunday morning and beneath any shower or storm that happens to move over a terminal. - RCG && .GGW WATCHES/WARNINGS/ADVISORIES... Lake Wind Advisory from 3 PM to 9 PM MDT Sunday for Central and Southeast Phillips-Central and Southern Valley-Garfield-McCone- Petroleum. && $$ weather.gov/glasgow