Hatcher Pass |
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Avalanche Warning
Issued: April 5, 2021 7:00 amTravel in avalanche terrain is not recommended. Avoid being on or beneath all steep slopes. |
Tuesday, April 6: The Avalanche Warning has EXPIRED. The next update will be Thursday morning at 7am.
DOT says the road will be closed for awhile.
An AVALANCHE WARNING has been extended and is in effect until Tuesday, April 6 at 7am. The Avalanche danger will be HIGH today. Human triggered avalanches are VERY LIKELY and naturals are LIKELY on all aspects, at all elevations.
HP received 11″ inches of new snow with 2″ inches of water and winds gusting 20-40 mph for the past 24 hours.
The persistent weak layer has been easily overloaded by this storm. Numerous large natural avalanches have been reported at Hatcher Pass yesterday that have hit and covered the road.
The road is CLOSED before Skeetawk and we encourage you not to travel anywhere at Hatcher Pass at this time.
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. |
Reports of large D3+ natural avalanches that occurred after 2:30 pm on 4/4.
Recent avalanches are currently being investigated.
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 |
Large Persistent slabs, 2′ to 4′ feet deep, will be very likely to human trigger today on all aspects , at all elevations today. Naturals will be likely.
A significant amount of precipitation from yesterday’s storm has destabilized the snowpack resulting in many large natural avalanches yesterday. Moderate to strong winds been consistent from the SSE/SSW/W through late last night.
Winds slab may step down into the Persistent slab. Persistent slabs may also fail at or near the ground.
Persistent slabs are sitting on a widespread weak sugary faceted layer on top of a widespread sun crust/drizzle crust combo in many locations at Hatcher Pass. Whumping, cracking, collapsing, and recent avalanches are RED FLAGS for this avalanche problem.
This is an unusual set up for Hatcher Pass for April. Unfortunately this problem is not going away. This is not the time to be in the mountains. The Hatcher Pass road is closed. Please do not attempt to go up to Hatcher Pass at this time. DOT and avalanche assessment needs to occur.
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 |
Moderate to strong winds from the SE, SW, W, NW have been persistent for 24 hours, forming wind slabs on many aspects at mid and upper elevation. Winds gusted as high as 40mph at 3550′ yesterday. Wind slabs, 6″ to 12″ thick, will be very likely to human trigger today on NW,N,NE,E, and SE aspects at mid and upper elevation. Naturals will be likely. Wind slabs will have the potential to step down into the PERSISTENT SLAB and fail 2′ to 4′ deep, increasing the size and consequence of the avalanche.
More information will be gathered over the next few days about recent avalanches.