Another shot of snow and wind has moved in overnight covering the clear skies and great riding and skiing conditions that many folks found yesterday. This new system is taking center stage but we did get some great footage of the natural cycle that occurred 2 days ago in the Valentine’s Day storm snow. Check out the many observations/photos sent in on our observations page.
By 6AM this morning we have picked up 3-4” of low density snow and another 5-10” is forecast to be on the way. This is coming in with strong east winds and slightly warming temperatures. Storm snow avalanches will be our primary concerns. These include shallow storm slabs, larger wind slabs and fast running loose snow sluffs.
Wind slabs will be the most concerning and likely to be fairly sensitive to human triggers as they are sitting on colder weaker snow. There is ample existing snow available for transport (yesterday’s cold powder) to build 1-2′ think slabs even if new snow amounts are less than expected. Near and above treeline elevations began seeing wind transport yesterday afternoon and these have only grown as winds have increased since then. Watching for areas with stiffer wind deposited snow and cracking in the new snow around you will be clues you have found a slab. These are most likely to be found on rollovers, off ridgelines and in cross-loaded gullies.
Below is a photo from yesterday’s east wind hitting Grand Daddy Peak producing a plume blowing snow low onto its western face.
Below treeline: Keep an eye out for winds to penetrate below treeline and build shallow touchy wind slabs. Loose snow sluffing on slopes steep and long enough will also be likely as this storm is colder with snow to sea level.
We continue to find a variable and concerning mid-pack snow structure at the mid elevations between 1,500’ and 2,800’. This is more pronounced in the Girdwood Valley. Buried 2-4’ deep now is a thin layer of weak snow sitting on a crust formed in late January. We have yet to see any avalanche activity on this crust in the Turnagain area but there has been some in the Girdwood Valley during the past week. Our pits are telling us this interface is fairly hard to trigger but it is present in the Pass. As more snow loads slopes with additional weight the potential exists for a deeper and more dangerous avalanches to occur at mid-elevations. If you haven’t already done so, check out Graham’s video from yesterday.
Yesterday’s window of opportunity €“ sun, light east wind and temps in the teens €“ was a bit too short lived for many folks. Currently, a low pressure system is moving up the western Gulf bringing another quick shot of snow as well as a Winter Weather Advisory from the NWS.
Today, we are looking at snow totals of 8-12 € by this evening with strong easterly winds. The flow is cold enough that snow should fall at sea level. We have picked up around 3-4 € so far by 6am this morning. The associated east winds ramped up to the 30’s with gusts to 60mph overnight and will fluctuate near here for the first part of today before tapering off by noon. Temperatures are climbing from the teens to the low 30’s at sea level to the upper teens at the ridgetops.
Tomorrow, the remnants of this system look to clear out with a break in clouds, precip and wind. Another low pressure moves into the Gulf on Tuesday as our active weather pattern continues.
Fitz will issue the next advisory tomorrow morning, February 18th.
|05/28/22||Turnagain||Avalanche: Turnagain Pass – late May wet slab cycle||CNFAIC Staff|
|05/21/22||Turnagain||Avalanche: Magnum, Lipps and Tincan||CNFAIC Staff|
|05/17/22||Turnagain||Avalanche: Sunburst||CNFAIC Staff|
|05/17/22||Turnagain||Observation: Tincan Ridge||Joe Kurtak|
|05/11/22||Turnagain||Avalanche: Cornbiscuit and Magnum west faces||CNFAIC Staff Forecaster|
|05/07/22||Turnagain||Observation: Granddaddy||Kit Barton|
|04/29/22||Turnagain||Observation: Sunburst wx station||AS/ MM/ AM/ NH|
|04/28/22||Turnagain||Observation: More Turnagain Pass/Summit Lake wet slab activity||Alex Marienthal|
|04/27/22||Turnagain||Observation: Magnum||Sykes / Buttrick Forecaster|
|04/27/22||Turnagain||Observation: Girdwood/Summit/Turnagain Road obs||A S|
Status of riding areas across the Chugach NF is managed by the Glacier and Seward Ranger Districts, not avalanche center staff. Riding area information is posted as a public service to our users and updated based on snow depth and snow density to prevent resource damage at trailhead locations. Riding area questions contact: firstname.lastname@example.org
|Area||Status||Weather & Riding Conditions|
This is a general backcountry avalanche advisory issued for Turnagain Arm with Turnagain Pass as the core advisory area. This advisory does not apply to highways, railroads or operating ski areas.