textproduct: Glasgow

DISCUSSION

KEY MESSAGES:

1) Milder temperatures will continue over the next couple of days.

2) Low clouds and freezing fog is expected through Friday. Dense Fog Advisory in effect through 11 AM tomorrow.

WEATHER PATTERN OVERVIEW: A large high amplitude ridge will continue over the western U.S. and influence NE Montana with mild and dry weather conditions. There will be a sharp gradient along a backdoor cold front with much of the northeast half of the CWA seeing lows each day in the single digits to teens and highs in the 20s and 30s. Meanwhile, lows over the Little Rockies and south of Fort Peck Lake will be in the 20s and low 30s with highs in the mid 30s and 40s each day.

This will allow for snowpack to melt and drag the moisture up over the front for continued freezing fog and low stratus. While extent, intensity, and timing beyond tonight are not well known, fog and low stratus does look to hang on in one form or another through at least Saturday morning.

Ridge pattern looks to intensify Saturday night into Sunday with a drier airmass entering the area. A cold front also arrives Monday and should also help to clear some long term fog and low stratus out of the area.

FORECAST CONFIDENCE & DEVIATIONS: Very slightly raised PoPs Friday. Used HRRR and HiResWarw as inspiration for visibilities. Kept fog in the grids through Friday afternoon.

AVIATION

LAST UPDATED: 2130Z

FLIGHT CAT RANGE: Airport Shutdown - VFR

DISCUSSION: Fluctuating ceilings and visibility with freezing fog through the TAF cycle. Flight cats could lower down to near airport shutdown at times. Intensities and placement is highly variable and low confidence continues in these elements.

WIND: East at less than 10 kts.

GGW WATCHES/WARNINGS/ADVISORIES

Dense Fog Advisory until 11 AM MST Friday for Central and Southeast Phillips-Central and Southern Valley-Daniels-Dawson- Eastern Roosevelt-Garfield-McCone-Northern Phillips-Northern Valley-Prairie-Richland-Sheridan-Southwest Phillips-Western Roosevelt-Wibaux.