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Forecast for the Salt Lake Area Mountains

Trent Meisenheimer
Issued by Trent Meisenheimer on
Wednesday morning, March 11, 2020
Most terrain has a LOW avalanche danger. Areas of MODERATE danger, however, do exist for wind drifts in (but not limited to) the upper elevations. These will be most pronounced on steep northwest to northeast to south-facing slopes.
Keep an eye on the southerly facing terrain for wet snow avalanches if the cloud cover dissipates, and the intense March sun becomes stronger than forecasted.
Low
Moderate
Considerable
High
Extreme
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Weather and Snow
Under mostly clear skies, the mountain temperatures bottomed out in the mid 20's °F allowing the snow to re-freeze at the lower elevations and on sunny aspects. Winds overnight backed to the southwest and are currently blowing 10-15 mph gusting into the mid and upper 20's at ridgeline.
For today, we will see increasing clouds streaming overhead as a closed low off the coast of California ejects moisture ahead of the storm. Winds will remain from the southwest for much of the day at speeds of 10-20 mph across the upper elevations. The sky cover will vary a lot today with filtered sun, partly cloudy, to cloudy skies at times. It is spring after all. This afternoon a shallow cold front will cross into northern Utah around 3:00 pm; winds will veer north and bring some snow showers to the mountains with 1 to 4 inches of new snow possible. Next week could be the return to winter. Stay tuned
Recent Avalanches
We had one report of a human triggered avalanche from the Provo Area mountains on a NE facing slope in Upper Big Springs (Photo below). This wind slab avalanche was 20'-40' feet wide and about a foot deep. Nobody caught. The intense sun yesterday produced many small wet loose avalanches on the southerly facing terrain.
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Avalanche Problem #1
Wind Drifted Snow
Type
Location
Likelihood
Size
Description
Continued winds overnight will keep a mention of wind drifted snow primarily along the higher elevation bands as well as a few pockets of wind drifts just to the lee of some mid-elevation ridgelines. These wind slabs may be up to a foot deep and 100' wide and reactive to cornice drops and slope cuts. Yesterday's recent avalanche in the Provo Area is an excellent example of this problem.
Avalanche Problem #2
Wet Snow
Type
Location
Likelihood
Size
Description
Wet snow avalanches can be exceptionally challenging to forecast, particularly with variable cloud cover. The good news is this problem is easily managed by paying attention to the snow you're riding on. If the snow is dry (powder) or frozen, then there is no problem, and you should turn your focus to wind drifted snow.
If the snow is damp and wet, then it's time to look for pinwheels, and rollerballs cascading down. If you see this, it's probably time to change your aspect to more northerly facing (colder) terrain where there are no wet snow issues.
General Announcements
This information does not apply to developed ski areas or highways where avalanche control is normally done. This forecast is from the U.S.D.A. Forest Service, which is solely responsible for its content. This forecast describes general avalanche conditions and local variations always occur.