textproduct: Glasgow

DISCUSSION

KEY MESSAGES:

- A strong winter storm over the area will end by mid morning today. - Arctic air remains over the area through tonight.

- Much warmer temperatures arrive on Sunday. WEATHER PATTERN OVERVIEW:

Headline hazard products have been maintained to cover all remaining snow accumulations through early this morning and cold wind chills. The area remains on the periphery of an upper level trough and surface arctic high pressure system, keeping a Cold Weather Advisory for the Hi-Line to the North Dakota border through noon today. The winter weather headlines are set to end at 8 AM this morning. There is also potential for lake effect clouds and snow to come off of Fort Peck Lake to affect Glasgow and Fort Peck through this evening as winds are expected to be fairly light this afternoon.

Cold weather will stay around this evening, so there is potential for another cold weather product tonight before temperatures begin increasing by early Sunday morning.

By Sunday warmer high pressure pushes in from the west with substantial temperature recovery being aided by a chinook event off the east side of the northern Rockies. The warm up will be at least initially be limited due to the heavy snow cover in place, particularly in the Milk and Missouri river valleys. However, the winds justify mixing down above freezing temperatures by Monday afternoon throughout the area. Potential hazards to watch for with this chinook pattern next week will be high winds in the Little Rockies, as well as fog and minor flooding from snow melt.

FORECAST CONFIDENCE & DEVIATIONS:

There is high confidence in wind chills remaining below zero through early Sunday morning. Beside areas around Fort Peck Lake, there is high confidence of snow coming to an end by 8 am this morning. Made slight adjustments to winds, PoPs, and temperatures through tomorrow to account for more extreme cold with the Arctic airmass and challenges of mixing out the inversion on Sunday given low confidence for above freezing temperatures at lower elevations then.

AVIATION

LAST UPDATED: 1010Z

FLIGHT CAT RANGE: LIFR to VFR

DISCUSSION: A winter storm over the area will slowly wind down from north to south through the day. With light winds and cold temperatures over Fort Peck Lake, there is moderate confidence of MVFR and scattered IFR occurring for KGGW through 00Z today from clouds and isolated snow showers coming off the lake. There is moderate confidence all other TAF sites will reach VFR conditions by 21Z. Cold temperatures are expected to remain in place through tonight before improving on Sunday.

WINDS: East at 5 to 10 knots, becoming light and variable after 15Z, becoming southeast at 5 to 15 knots after 00Z.

GGW WATCHES/WARNINGS/ADVISORIES

Cold Weather Advisory until noon MST today for Central and Southeast Phillips-Central and Southern Valley-Daniels-Dawson- Eastern Roosevelt-McCone-Northern Phillips-Northern Valley- Richland-Sheridan-Western Roosevelt-Wibaux.

Winter Storm Warning until 8 AM MST this morning for Central and Southeast Phillips-Central and Southern Valley-Dawson-Garfield- McCone-Northern Phillips-Petroleum-Prairie-Southwest Phillips- Wibaux.

Winter Weather Advisory until 8 AM MST this morning for Daniels- Eastern Roosevelt-Northern Valley-Richland-Western Roosevelt.