Western Wyoming PM Forecast

Issued on Sat January 25, 2020 7:06 PM

Situation

A westerly flow with limited moisture has been bringing pulses of snow to the mountains and mild temperatures to the lower elevations. The highest elevations of the Teton Range have received 3 to 6 inches of new snow since yesterday afternoon. About halve of that fell last night. The other half fell late today. Most other areas have received a trace to 2 inches. Under mostly cloudy skies temperatures have been in the teens and 20’s in the mountains and in the 20’s and 30’s in the valleys. Winds on the summits have been from the west at 15 to 25 with gusts to 45 miles per hour.

During the past six days snow has dribbled into the area. A total of 6 to 12 inches has fallen in favored higher elevation terrain since sun crusts and surface hoar formed on January 19. In the higher elevations of the Teton Range shallow soft slab avalanches were triggered by skiers and snowboarders in steep terrain today. At 8:37 this morning an avalanche was observed to have released naturally on the east face of the Grand Teton. Last night's mild temperatures caused some roofs to slide.

Forecast For Sunday, January 26, 2020

The upper elevation flow will continue to favor the higher elevations of the western portions of our forecast areas. Skies will remain mostly cloudy. Another 3 to 6 inches of new snow may accumulate in the favored locations by tomorrow evening. Less favored areas could receive 2 to 4 inches. A trace to an inch is likely in the valleys. Temperatures will be in the upper teens and 20s in the mountains and in the 20s and 30’s at the lower elevations. Winds will be from the west at 10 to 15 miles per hour with higher gusts.

At the higher elevations small pockets of wind slab could be triggered by skiers and riders in steep wind loaded avalanche starting zones. These small surface slabs could be 6 to 18 inches deep and could quickly become a significant hazard in steep chutes and cliff areas. Some potential continues for humans to trigger deep persistent slab avalanches. Although the likelihood for these dangerous slab avalanches to be human triggered continues to slowly decrease the consequences of triggering a slab avalanche 3 to 7 feet deep are still likely to be severe. Avalanches are unlikely at the lower elevations except on isolated terrain features. The general avalanche hazard is expected to be moderate above an elevation of 7,500 feet and low below that elevation.

Trend For Monday, January 27, 2020 AND Tuesday, January 28, 2020

The next in a series of pulses of Pacific moisture is anticipated to arrive on Tuesday. Significant changes in the avalanche hazard are not expected.
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