Numerous natural slab avalanches were observed this week, likely occurring 1/25 to 1/28, 1-2′ deep, up to D2 in size, failing on new snow/old snow interface, West > North > East, in elevations band 4,000′ to 4800′. See observation and PICS here.
Numerous natural dry loose sluffs were observed this week with 7-9.5″ of new, low density snow, the majority of which accumulated on 1/28, on all aspects, on slopes above 40º. Many of the loose dry avalanches occurred during the 1/28 storm, with more natural activity on 1/31 with the first direct solar gain on the new snow.
Yesterday, 2/1 – On the northern side of Friendship pass near Dog Sled Pass, a human triggered slab avalanche was reported on a NW aspect, 35-38º slope, 4700′, D1.5. One person was caught and carried, partially buried to their chest, no injuries. 2 pictures below.
This week’s weather at 3550′:
Temps averaged 25ºF, with a low of 17ºF and a high of 23ºF.
7-9.5″ of new snow accumulated this week.
Overnight at 3550′:
Temps averaged 14°F.
No new snow.
This week’s weather at 4500′:
Temps averaged 22ºF, with a low of 12ºF and a high of 27ºF.
Winds averaged SE 6 mph, max 13 mph . Gusts averaged SE 10 mph, max gust SE 23 mph.
Overnight at 4500′:
Temps averaged 11ºF overnight, with a Low of 10ºF.
Winds averaged SSE 4 mph overnight. Max gust S 19 mph.
NWS Rec Forecast HERE
NWS point forecast HERE
State Parks Snow Report and Motorized Access information HERE
A weather pattern change is forecasted for Sunday through Monday. Southwest flow is expected to bring new snow, with preliminary estimates at 15″. Models are showing winds 20-30 mph at 5000’. Additionally, surface hoar is currently widespread, 2-4mm in size. New snow and wind will increase the avalanche hazard.
NWS recreations forecast
The Hatcher Pass Mountain Forecast covers the mountains in the Hatcher Pass Recreation Area. This forecast is for use in snow safety activities and emergency management. Today Tonight Temp at 1000` 15 F 12 F Temp at 3000` 17 F 19 F Chance of precip 0% 50% Precip amount (above 1000 FT) 0.00 in 0.07 in Snow amount (above 1000 FT) 0 in 0-2 in Snow level sea level sea level Wind 3000` ridges LGT/VAR SE 0-7 mph Remarks...Broad and moist southwesterly flow sets up early Sunday morning and continues through Sunday night. A rough 24 hr(Sunday morning through Sunday night) snowfall estimate of 15 inches is possible in the higher elevations toward the mine.