Western Wyoming PM Forecast

Issued on Wed November 20, 2019 5:49 PM

Situation

Colder air is moving into the region. Temperatures at 10,500 feet rose into the mid-30’s yesterday afternoon. They were in the mid-20s at sunrise this morning and were heading towards the teens at sunset. Winds that were from the southwest have veered to the east and northeast. These changes are due to a cold front that moved from Montana into Wyoming and has pushed south to the Colorado border. At the same time a deep, low-pressure system that is centered over Southern California is feeding moisture northward towards into the southern portion of our forecast area.

Skies were mostly cloudy today with areas of light snowfall at the higher elevations. Snowfall amounts vary from a trace to a couple of inches with the higher amounts falling in the Togwotee Pass area and on the southern end of the Wyoming Range. At the upper elevations this new snow is accumulating on a shallow snowpack that is 1 to 2 feet deep and comprised of a mix of crusts and faceted snow crystals.

Forecast For Thursday, November 21, 2019

Additional snowfall accumulations of several inches are possible overnight in Salt River and Wyoming Ranges. On Thursday skies will gradually clear from north to south. Temperatures will be in the teens and 20’s. Northeast winds will decrease before backing to the southwest.

The existing snowpack is mostly stable. Avalanches are unlikely. The general avalanche hazard is low.

Trend For Friday, November 22, 2019 AND Saturday, November 23, 2019

Conditions will be much dryer with significant temperature inversions as warm air begins to move in aloft. The high-pressure ridge that has dominated our weather since the beginning of November is anticipated to finally erode by Sunday and may open the door for some snow to move into Western Wyoming on Monday. The avalanche hazard will remain mostly unchanged until the next significant storm cycle.
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