Advisory: Ogden Area Mountains | utahavalanchecenter.org

Avalanche Advisory

Advisory: Ogden Area Mountains	Issued by Drew Hardesty for February 17, 2013 - 6:42am

Above 8,500 ft.

7,000-8,500 ft.

Below 7,000 ft.

bottom line

It's mostly LOW danger. An isolated pockety MODERATE still exists:

in the alpine for triggering shallow wind drifts up to a foot deep
persistent slabs up to 3' deep in northerly>easterly thin snowpack areas.
shallow wet push-a-lances in sheltered terrain below about 8000'.

danger scale:	1. Low	2. Moderate	3. Considerable	4. High	5. Extreme

current conditions

Skies are overcast ahead of what looks to be a quick-hitter cold front later this morning. It'll be mostly a brush-by to the north and we'll pick up a couple traces of snow for the effort. Ahead of the front, winds are west to southwest, blowing 15-20mph with some of the higher elevation anemometers registering gusts into the 40s. Overnight lows are in the upper 20s to low 30s with a few stations in the mid elevations showing little to no refreeze. That's ok - after frontal passage, things should lock up pretty well, as temps dive to the upper single digits to low teens. Riding conditions remain quite good in the northerly sheltered terrain. Who could complain?

recent activity

It's like the Island of Misfit Toys. A few minor wet and dry sluffs, a cornice induced 1' deep and 100' wide soft slab high in the Ogden mountains, a shallow skier triggered wind slab 75' wide in east facing terrain at 9200' in the Ogden area mountains; a natural hard slab at 11,000' in Provo 1' deep and 100' wide with timing unknown,

Avalanche Problem 1over the next 24 hours

type

aspect/elevation

characteristics

Above 8,500 ft.

7,000-8,500 ft.

Below 7,000 ft.

likelihood	size
likely unlikely	large small
distribution	trend
widespread isolated	More Dangerous Same Less Dangerous

description

A few comments about the few concerns for today:

Persistent Slab - mostly dormant, as evidenced by - at most - 3 collapse failure avalanches from the past week (Miller Hill - which only cracked out, upper Broad's Fork, and perhaps upper Maybird) - all in steep north through east facing terrain above 9000' with general recent wind loading involved.
Wet activity - I suspect areas with a poor refreeze - low to mid - elevation northerly to easterly terrain may allow for some shallow push-alanches until the front has had time to lock things up.
Wind slabs - old and new shallow wind drifts may crack out in the high north through east facing starting zones. Many of these are increasingly stubborn and may not necessarily be triggered by ski or slope cuts or cornice drops.

weather

We'll be back to winter in the blink of an eye. The tulips, crocuses and zinnias will have to wait. Temps dive with the day's cold front. Clearing skies for tonight and tomorrow ahead of the 1st in a series of cold Pacific storms due to arrive later Tuesday...sticking around through later Thursday. It bears some resemblance to last weekend's closed Low that moved overhead and brought a foot of snow. Moderate to strong southerly winds precede things on Tuesday. The next storm moves in through the weekend with the active pattern likely continuing through early next week.

general annoucements

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If you trigger an avalanche in the backcountry - especially if you are adjacent to a ski area – please call the following teams to alert them to the slide and whether anyone is missing or not. Rescue teams can be exposed to significant hazard when responding to avalanches, and do not want to do so when unneeded. Thanks.

Salt Lake and Park City – Alta Central (801-742-2033), Canyons Resort Dispatch (435-615-3322)

Ogden – Snowbasin Patrol Dispatch (801-620-1017)

Powder Mountain Ski Patrol Dispatch (801-745-3772 ex 123)

Provo – Sundance Patrol Dispatch (801-223-4150)

Dawn Patrol Forecast Hotline, updated by 05:30: 888-999-4019 option 8.

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This advisory is produced by the U.S. Forest Service, which is solely responsible for its content. It describes only general avalanche conditions and local variations always exist. Specific terrain and route finding decisions should always be based on skills learned in a field-based avalanche class.

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