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KEY MESSAGES

- Drifting/minor blowing snow ending over Sheridan county.

- Cold arctic air will be in place through at least Friday. Cold Weather Advisories in effect midnight tonight till 11 am Thursday for zones along the Canadian border.

- The next disturbance arrives Tuesday with the chance of snow.

DISCUSSION

WEATHER PATTERN OVERVIEW:

Weather pattern has an upper level trough over the western states with disturbances rotating through the trough. Last night's disturbance will finally exit Sheridan county, where blowing snow continued with visibility at 1 mile at noon. Tonight's disturbance will pass to our south with accumulating snow expected in the SW zones. Snow may accumulate to an inch or so in Petroleum county by Thursday morning.

An upper ridge then builds in over the weekend into Montana but a surface high pressure extending south into eastern Montana will keep it cold.

An upper low sitting off the Pacific NW coast will send a moderate disturbance east across Montana Tuesday that will bring snow to the CWA. Amounts look light at this point as it looks to be moisture starved after cross over the Rocky Mountains. FORECAST CONFIDENCE & DEVIATIONS:

Forecast largely followed NBM and WPC guidance this forecast cycle.

Confidence is high on the cold arctic air mass remaining in place until at least Friday but low on the timing of when warmer temperatures will move in this weekend and beyond. TFJ

AVIATION

LAST UPDATE: 1950Z

FLIGHT CAT RANGE: VFR/MVFR

DISCUSSION: Low ceilings (MVFR) will linger through the night in most places with a disturbance moving east through southern Montana and Wyoming.

WINDS: Northwest will gradually diminish into Thursday with speeds Thursday 10 kts or less, but 10-20 kts at KSDY. TFJ

GGW WATCHES/WARNINGS/ADVISORIES

Cold Weather Advisory from midnight tonight to 11 AM MST Thursday for Daniels-Northern Phillips-Northern Valley-Sheridan.