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Hatcher Pass has received approximately 7” of new snow this week and an additional 2″ last night. Today’s avalanche problems are Storm Slabs, Winds Slabs and Dry Loose. It will be possible for humans to trigger small storm slabs 7” thick at all elevations on all aspects. Small human triggered Wind Slabs, 3-5” thick will be possible at mid and upper elevations, on West thru North aspects. Natural avalanches are unlikely.
Recent avalanches, shooting cracks and whumping will be red flags for today. Small avalanches can still be dangerous, especially if they sweep you into terrain traps.
Riding conditions have improved, rocks and other hazards are slowly getting buried deeper. Ridge tops still have shallow conditions.
Join us on Zoom Sunday, February 28th at 7:00pm to meet the HPAC founders and forecasters! You’ll get a chance to meet Jed, Allie and Jake, and learn about the state of the snowpack in Hatcher Pass. This is a great opportunity to gain a better understanding of the current conditions, and get to know the folks who help keep us informed about backcountry conditions. Sign up is required, click here to register.
There were two small human triggered Storm Slab avalanches reported this week and potentially more that were unreported due to poor visibility the past few days.
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 |
7” of new ‘upside down snow’ fell on 2/24 which has created a soft storm slab. 2” of additional snow from last night newly blankets the storm slab. Human triggered avalanches are possible, natural avalanches are unlikely. These Storm Slab avalanches will be small in size, 7” thick, and found at all elevations and on all aspects. Expect storm slabs to be inverted due to temperatures warming throughout the storm. Stiff snow over softer snow will be an indicator of this problem. This avalanche problem will improve within 24-48 hours.
Hand pits, using small test slopes, and instability tests will help you identify this problem. Whumping and shooting cracks will be red flag clues for this avalanche problem.
We recommend using low risk travel techniques when traveling in or around avalanche terrain. Spread out when ascending slopes, only descend slopes one at a time, and choose safe zones that are out of harm’s way.
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 winds with strong gusts from the SE blew for 5 hours on 2/24. These winds have created small wind slabs in specific areas with slabs averaging 3-5” thick. These are located at upper elevations on west thru north aspects. These wind slabs will be small in size and human triggered avalanches are possible. Natural avalanches are unlikely.
Shooting cracks are a red flag for Wind Slabs. Look for smooth freshly drifted snow overlying weak snow when trying to identify this avalanche problem. Pole tests and hand pits will help you quickly identify this avalanche problem. Last night’s new snow will make identifying this problem more challenging. We expect this wind slab problem to be short lived and to diminish within 24-48 hours.
Over the past 48 hours 9″ of new snow has fallen. This new snow will be capable of producing dry loose avalanches at all elevations on all aspects. This avalanche problem will be found on slopes 40° or steeper in isolated areas. Human triggered avalanches are possible and will be small in size. Natural avalanches are unlikely.
New snow totals 2/21-25:
Independence Mine: 9” of new snow
Frostbite bottom: 5″ of new snow
At the start of this week, temperatures were in the single digits with clear sky and calm winds. On 2/22 1” of new snow fell, and the temps remained cool. After this small amount of snow fell, the temperature dropped below zero for a short period of time. Starting 2/23 a storm system began moving into the Mat Su valley. On 2/24 temperatures began to rise quickly, and 6-7” of new snow fell in Hatcher pass. At the same time winds from the SE blew for 5 hours and was able to transport some of this new snow. After a brief break in the storm another 2-3” of new snow fell late last night and early this morning.
NWS Rec Forecast here.
NWS point forecast here.
State Parks Snow Report and Motorized Access information here.
Independence Mine 2/21-25:
|
Temp
|
RH
|
Spd
|
Gust
|
Dir
|
|
|
|
SWE
|
SnoHt
|
|
---|---|---|---|---|---|---|---|---|---|---|---|
Min | -4 | 32 | 0 | 0 | N | 39 | |||||
Max | 26 | 93 | 6.2 | 12.8 | N | 10.3 | 48 | ||||
Average | 11.1 | 78.1 | 2.1 | 5.1 | – | 9.4 | 41.5 |
Marmot 2/21-25:
|
Temp
|
RH
|
Spd
|
Gust
|
Dir
|
---|---|---|---|---|---|
Min | -1.8 | 41 | 0 | 2 | N |
Max | 20.2 | 98 | 12 | 20 | N |
Average | 8.3 | 89.4 | 4.3 | 8.9 | – |