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A MODERATE avalanche danger exists above 2500′ for lingering wind slab avalanches in steep wind-loaded terrain and cornice falls. Triggering a wind slab 1-3′ thick on an unsupported slope or cross-loaded gully is still possible. Give cornices and glide cracks a wide berth. Keep the chance of triggering a persistent slab avalanche in high elevation terrain on your radar.
The final accident report from the first US avalanche fatality of the 2019/20 season that happened in Colorado is available and is worth a read: https://avalanche.state.co.us/caic/acc/acc_report.php?acc_id=726&accfm=inv. Our deepest condolences to family, friends and all involved.
Travel Advice | Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features. | Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern. | Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding, and conservative decision-making essential. | Very dangerous avalanche conditions. Travel in avalanche terrain not recommended. | Extraordinarily dangerous avalanche conditions. Avoid all avalanche terrain. |
Likelihood of Avalanches | Natural and human-triggered avalanches unlikely. | Natural avalanches unlikely; human-triggered avalanches possible. | Natural avalanches possible; human-triggered avalanches likely. | Natural avalanches likely; human-triggered avalanches very likely. | Natural and human-triggered avalanches certain. |
Avalanche Size and Distribution | Small avalanches in isolated areas or extreme terrain. | Small avalanches in specific areas; or large avalanches in isolated areas. | Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas. | Large avalanches in many areas; or very large avalanches in specific areas. | Very large avalanches in many areas. |
Signal Word | Size (D scale) | Simple Descriptor |
Small | 1 | Unlikely to bury a person |
Large | 2 | Can bury a person |
Very Large | 3 | Can destroy a house |
Historic | 4 & 5 | Can destroy part or all of a village |
With improving visibility and surface conditions more folks have been venturing into higher terrain. Temperatures are dropping, there is settlement in the snowpack and more time has passed since the last loading event. These factors are generally positive for the overall stability and triggering an avalanche is trending towards unlikely. However, in the Alpine caution is still advised on specific terrain and there is some lingering uncertainty about persistent slab potential above 3000′ (See Avalanche Problem 2). As you travel today there are a few things to keep in mind. Steep (35°+) unsupported slopes or wind-loaded gullies may still harbor stubborn wind slabs near ridgelines. Feel for stiff snow over soft snow and listen for hollow sounds. Remember even a small avalanche can be serious in high consequence terrain.
Cornices: Cornices may still fail under the weight of a person and often break farther back than expected. Pay attention to other groups traveling above or below you.
Signal Word | Size (D scale) | Simple Descriptor |
Small | 1 | Unlikely to bury a person |
Large | 2 | Can bury a person |
Very Large | 3 | Can destroy a house |
Historic | 4 & 5 | Can destroy part or all of a village |
So… maybe you are using this weather window to go for a bigger objective or to explore up high? We have limited information about the snowpack above 3500′. Every time we dig a pit above 3000′ we find the Veterans Day facets sitting on a crust under hard snow. The reactivity of this layer has been variable and the depth the layer is buried is also variable. What we do know is that facets are a persistent weak layer and present a lingering concern, like a little voice saying what if? The takeaway for today and into the weekend is that there is still a chance that someone traveling in upper elevation terrain may find the wrong spot and trigger a large avalanche. The mostly likely scenario for triggering this type of avalanche would be hitting a thin spot in the snowpack or near a rock poking through that initiates failure in the weak layer. The overall snowpack is shallower towards the southern end of Turnagain Pass, in Summit Lake and in the Crow Pass terrain just north of Girdwood.
Keep your eyes peeled for glide cracks in the terrain that you are traveling in. Steer clear and avoid lingering in the runout of this unpredictable hazard. There is a chance we may see some more glide cracks open and release as temperatures drop or the glide activity may completely stop.
Yesterday: Skies were partly cloudy and there was lingering valley fog. Temperatures were in the high to low 20°Fs depending on elevation. Winds were light and westerly. In the evening temperatures began to drop and went down 10 degrees at most area weather stations. Winds remained light and skies cleared overnight.
Today: Mostly sunny skies are on tap for today. This morning sea level stations are in the low 20°Fs and ridgetops are around 10°F. Highs today are forecast to be in the mid teens to single digits. Overnight skies will be partly cloudy and temperatures will be in the single digits. Winds will be light and westerly.
Tomorrow: Partly sunny with temperatures in the teens and single digits and light winds. The cold temperatures and sunshine continue through the Sunday. Looking forward the models show some potential for wintery precipitation during the holiday week! Fingers crossed. Stay tuned.
PRECIPITATION 24-hour data (6am – 6am)
Temp Avg (F) | Snow (in) | Water (in) | Snow Depth (in) | |
---|---|---|---|---|
Center Ridge (1880′) | 21 | 0 | 0 | 29 |
Summit Lake (1400′) | 15 | 0 | 0 | 7 |
Alyeska Mid (1700′) | 20 | 0 | 0 | 16 |
RIDGETOP 24-hour data (6am – 6am)
Temp Avg (F) | Wind Dir | Wind Avg (mph) | Wind Gust (mph) | |
---|---|---|---|---|
Sunburst (3812′) | 17 | W | 4 | 14 |
Seattle Ridge (2400′) | NA* | NA* | NA* | NA* |
*Seattle Ridge weather station is not reporting.
Date | Region | Location | Observer |
---|---|---|---|
04/21/24 | Turnagain | Observation: Bertha Creek | Anonymous |
04/20/24 | Turnagain | Avalanche: Spokane Creek | Schauer/ Mailly Forecaster |
04/16/24 | Turnagain | Observation: Cornbiscuit | Krueger / Matthys Forecaster |
04/15/24 | Turnagain | Observation: Taylor Pass | John Sykes Forecaster |
04/15/24 | Turnagain | Observation: Seward Highway – Tern Lake to Portage | Joel Curtis |
04/14/24 | Turnagain | Observation: Sunburst | T. Olsen-Lund, R. Sullivan I. Adams |
04/14/24 | Turnagain | Observation: Turnagain Pass Snomo | K. Gallaher |
04/13/24 | Turnagain | Observation: Spokane Creek | Everet Megli |
04/11/24 | Turnagain | Observation: Tincan | John Sykes Forecaster |
04/10/24 | Turnagain | Avalanche: Seattle Ridge | Schauer/ Keeler Forecaster |
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