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Issued
Fri, April 17th, 2020 - 7:00AM
Expires
Sat, April 18th, 2020 - 7:00AM
Forecaster
CNFAIC Staff
Conditions Summary

Friday, Apr 17th UPDATE:

DANGEROUS AVALANCHE CONDITIONS exist in the backcountry today and through the weekend. Travel in avalanche terrain is NOT recommended, avalanches can run into valley bottoms and much further than expected.

Hiking trails, such as Crow Pass and Byron Glacier, are threatened from avalanches occurring above. HEADS UP!

Yesterday several large and very large avalanches occurred from Girdwood south to Seward. These are large wet avalanches that are releasing due the snowpack warming dramatically. The pack is literally ‘falling apart’ at the seams and sliding off the mountainsides. This is not a time to be on hiking trails or in the backcountry unless you know for certain you are well away and far out from under avalanche paths. Photos and videos below are from Girdwood Valley on the Goat Mtn. shoulder.

Photo’s above and video by George Creighton, link HERE. Thanks George!

 

Video credit Adam Loomis, link HERE. Thanks Adam!

 


Original report from Tuesday, April 14th:

Operations UPDATE:  The CNFAIC Staff would like to thank everyone for their support during the past two weeks of suspended forecasts. We will be issuing our Springtime Tips this weekend. This weekend also marks the end of our regularly scheduled forecast season. We will continue to post observations and highlight any significant rise in avalanche danger through April 24th. At this point, our offices close and our Annual Report will be published.

Weather and Avalanche Outlook for Turnagain Pass and surrounding regions for Tuesday, April 14th and extending through the week:

And, spring looks like it’s finally arriving… After a two week cool spell, marked with mostly sunny skies, cold nights, a few inches of snow, and a handful of windy days, the pattern has changed… Sunday, April 12th, warmer air and moisture started to stream in from the south. Girdwood woke up to ~10″ of new snow at 2,000′ on Monday, April 13th, while Turnagain Pass saw 5-6″. Beginning Tuesday, April 14th, even warmer air is headed in. We are talking 32°F at 4,000′ warm during the pre-dawn hours… The good news however, there is not a lot of moisture expected to make it this far north, hence, weather models are only showing light rainfall for Wednesday and Thursday (Apr 15-16) at this time. Otherwise, it’s looking like generally warm springtime temperatures, cloudy skies and some chances for sprinkles. Keep up to date on our weather page!

Increasing Avalanche Danger:  Avalanche danger can be split into four different categories this week: wet snow, dry snow, glide avalanches and cornices. Roofs with remaining snow/ice are also likely to shed – heads up!

  • Wet snow avalanches will be a concern on slopes that have a wet and saturated surface. Whether this is from simply warm temperatures and sun (Tuesday’s forecast) or rain on snow (Wednesday – Thursday), human triggered and natural wet loose or wet slab avalanches are possible. Avoid steep slopes with 6″ or more of soft wet and saturated snow. Additionally:
    • Any slope with Monday’s new snow that sees its first warming will be ripe to avalanche 
    • No overnight re-freeze will increase wet snow avalanches – beginning Tuesday night.
    • A wet loose avalanche can trigger a larger slab, creating a much bigger slide
  • Dry snow avalanches will be at the higher elevations where snow has fallen and the wind has blown. Wind slabs are likely to be found on wind loaded slopes and dry sluffs in protected terrain.
  • Glide avalanches – yes the glide cracks are moving. Avoid being under them. They are likely to start releasing with the rising temperatures!
  • Cornice falls are also likely to become unstable and may begin to fall on their own this week.

Shed Cycle?  The Shed cycle is when the snowpack as a whole loses all cohesion due to melting and it literally falls off the mountainside in large wet avalanches. These types of avalanches are not expected yet, but something we (and you too) should all be watching for. Several nights in a row of above freezing temperatures at the ridgetops along with cloud cover and rain are indicators the cycle may begin.

 

 

Weather
Fri, April 17th, 2020

PRECIPITATION 24-hour data (6am – 6am)

Temp Avg (F) Snow (in) Water (in) Snow Depth (in)
Center Ridge (1880′)
Summit Lake (1400′)
Alyeska Mid (1700′)

RIDGETOP 24-hour data (6am – 6am)

Temp Avg (F) Wind Dir Wind Avg (mph) Wind Gust (mph)
Sunburst (3812′)
Seattle Ridge (2400′)
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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.