Advisory: Salt Lake Area Mountains | utahavalanchecenter.org

Avalanche Advisory

Advisory: Salt Lake Area Mountains	Issued by Drew Hardesty for April 7, 2013 - 6:03am

Above 9,500 ft.

8,000-9,500 ft.

Below 8,000 ft.

bottom line

We have a mostly Low avalanche danger in the mountains today. Watch for developing shallow and isolated wind slab along the highest ridgelines. Other problem areas include the mid-elevation east to north to westerly aspects where you may punch through or auger deeply into wet unconsolidated grains. Wet avalanche activity may be more pronounced in the Park City, Ogden and Provo where they've had a poor refreeze for the last 5 days...

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

current conditions

We're still in this alliterative warm, wet, westerly flow and we'll have yet another impulse of moisture moving through today that will be more pronounced north of I-80, particularly near the Logan area mountains. Skies are overcast, temps are in the mid to upper 20s and winds are light except for 20-25mph speeds along the 11,000' ridgelines.

If you lowered your expectations, riding conditions were not half bad yesterday up high in 1-2" of damp and dense above a supportable 2" thick melt freeze crust. Those smarter than me started high and stayed high for these conditions. Instead, I exited out a southerly facing drainage and found that the supportable crust became less friendly and I'd "trapdoor" to the ground through the "isothermal" damp to wet grains below. But not before becoming soaked by the rain/snow mix at 7500'. Would've made a Pacific Northwest'r feel right at home. Photo below after trapdoor-ing on the exit.

recent activity

None.

Avalanche Problem 1over the next 24 hours

type

aspect/elevation

characteristics

Above 9,500 ft.

8,000-9,500 ft.

Below 8,000 ft.

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

description

It's mostly Low danger. Call it much more and it takes the teeth out of Moderate. Still; there will be a few things to look out for today -

Shallow new 3-4" wind slab found above 9500' on predominantly easterly facing terrain. I don't expect much propagation with these, and these shouldn't pose much of a problem unless you're in or above radical no-fall terrain.
Cornices - this time of year takes its toll on the whales along the ridgelines. As the old Grand Canyon river guides say - There's two types of boatmen - those that've flipped their raft in Lava Falls...and those that're gonna. Same goes for those that wander too far out onto the cornices.
Wet snow issues, particularly in the mid elevation westerly to northerly to easterly aspects that harbor weak unconsolidated wet grains beneath a wolf-in-sheep's clothing melt-freeze crust. Avoid being in or above the steep walled gullies, ravines or creekbeds. If you have time to kill, here's a quick look at this structure from yesterday. Park City, Ogden and Provo mid elevations also have not had a decent refreeze below 8000' since Apr 2....and may be more prone for wet activity.
Glide avalanches, most notably in Stairs Gulch, Broads Fork, and Mill B South of Big Cottonwood Canyon. They're found elsewhere (Raymond Slabs into Porter Fork, etc), but these coy and capricious full depth releases are poorly understood and often release without so much of a hint or clue. They tend to be more active this time of year and warrant either avoidance of the drainage altogether or wide separation amongst party members while traveling through runout zones. The Canadians have a nice little piece on runout zones here.

weather

Today's westerlies should continue to favor the Logan area mountains with snow while the central Wasatch sees a skiff to 2". I expect a rain/snow line to remain at 7000' or so. Winds will increase to 20-25mph along the high peaks; temps will be in the mid 20s to low 30s. Tomorrow's cold winter storm has the Uintas written all over it. The storm approaches from the northwest but tragically closes off on itself, favoring, in this case anyway, the north slope of the Uintas and other areas favored by a north to easterly flow. They'll likely see 1-2' with 30-40mph winds through later Tuesday while the rest of us scrape by with perhaps an optimistic 6-10". With the winds as well. Another quick hitter arrives on Thursday.

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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