Bollettino valanghe

Provo

Pubblicato il Mar 1, 2023valido fino al Mar 2, 2023Utah Avalanche Center

Pericolo valanghe

Alta quota
Limite del bosco
Sotto il limite del bosco

Non aggiornato — questo bollettino è scaduto 3 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Today the avalanche danger is CONSIDERABLE. New snow, wind-blown snow, and more snow coming today are creating dangerous avalanche conditions. What worries me the most is that the danger won't seem obvious, and avalanches may be a bit stubborn to trigger. Nonetheless, avalanches have the potential to be large, destructive, and far running.

Problemi valanghivi

Wind Slabs
N
NE
E
SE
S
SW
W
NW
Alta quota
Limite del bosco
Sotto il limite del bosco
Probabilità
Likely
Dimensione
3
Strong winds from both the NW and SW have had lots of snow to transport and form both soft and hard slabs of wind drifted snow. One avalanche professional mentioned yesterday morning that his hat and sunglasses were blown off his head, and he had to bear hug his skis to keep them from being blown away as well.

Winds this morning are steadily easing, and snowfall today will hide these thick wind slabs. What is scary about this avalanche problem is that it will be camouflaged and a bit stubborn to trigger, but it can create big, deadly, destructive avalanches. I would avoid any wind-loaded slopes today which is most upper elevation terrain.
Storm Slabs
N
NE
E
SE
S
SW
W
NW
Alta quota
Limite del bosco
Sotto il limite del bosco
Probabilità
Likely
Dimensione
3
The new snow yesterday was upside down which is a good recipe for avalanches. The slab is the denser snow on top and the weak layer is the softer snow underneath. It will be a tug-of-war game today as the previous snow tries to stabilize (the glue drying) and the new snowfall today adds additional weight and stress. With so much new snow and more coming today, I am just not ready to trust it with my life.

I don't think you'll see any signs of instability in the new snow today which will make decision making difficult, and you can likely get away with riding in avalanche terrain. Personally, I would give it a day and consider stepping out a little tomorrow. There are too many layers within the new snow from the last two storms on which avalanches can break (see my video below from American Fork Canyon yesterday).

Recent Activity

Snow safety teams have triggered some large slab avalanches involving new snow and wind-drifted snow. I suspect some natural avalanches also occurred early yesterday morning during strong winds and intense snowfall.

One avalanche was spotted on Timpanogos (photo below). There were likely more but no one has been able to see them. Recent avalanches have either been obscured by poor visibility or covered over by wind-blown snow.

Snow and Weather

Storm totals as of 0400 this morning:

Upper Cottonwoods 34" snow (2.6-2.8" water)
Park City Ridgeline 18-24" snow (1.3" water)
Provo area mountains 23-33" snow (2-3" water)
Ogden area mountains 25-34" snow (2.4-3.2" water)

Strong winds over the last two days have blown from both the SW and NW.

Temperatures this morning range from about 13°-17° F. Winds have eased and are averaging 10 mph gusting 15-25 mph from the SSE. Snowfall was just starting again at 0400.

Today temperatures will only warm to about 20° F. Overall winds will steadily drop through the day to barely a breath by the end of the day. Snowfall will ramp up this morning and 6-10 inches of new snow is possible by the end of the day.

Thursday will have a break in the active weather with "brief ridging", and we should see some sunshine (fresh pow and sun!). Temperatures remain cold through the weekend as cold air will continue to push south. A quick moving storm will bring more snow Friday. On Saturday the jet stream will begin to develop a strong zonal flow from the west over Utah and more snow should continue Sunday and into next week but the details are uncertain just yet.

Additional Info

The lowest elevation band has some tricky conditions as we've seen avalanches in the foothills as low as 6,200'. There is more than enough snow in the lower elevation foothills that there is good riding to be had close to home. These three avalanches stand out in that they all occurred in low elevation easy to access terrain that you can see from highways and neighborhoods. Check out Craig's video discussing a low elevation avalanche in Browns Canyon HERE, Drew's video discussing an avalanche in the Salt Lake Foothills HERE, and JB's report from the Ogden Foothills HERE. These are the types of slides that can impact people with little knowledge of avalanche terrain. Please share this information with your friends who may not regularly read the avalanche report.

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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.

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