Register for an account and never miss a forecast again!
RegisterRegister for an account and never miss a forecast again!
RegisterJan 30th, 2015–Jan 31st, 2015
.
There is still some uncertainty regarding potential persistent slab layers east of the crest, however, recent tests indicate overlying strong snow layers are limiting the potential for human trigger. Snow pits may help determine if this layer is still present or reactive in your area.
An upper ridge will weaken slightly, but remain over the region Saturday. This will cause light winds, sunny weather and mild temperatures. High clouds should move in during the day a weak frontal system approaches. Persistent cooler temperatures at lower elevations should maintain low clouds or fog, especially in the valleys and elevations below about 3000 feet.
This weather will cause little change in snow conditions and maintain an overall low danger.
Warmer weather is causing persistent weak layers from January 15th to become less or non-reactive. This problem will be listed as unlikely for the northeast and central east zones.
Due to the low snowpack at lower elevations watch for terrain hazards such as open creeks, partially covered rocks and vegetation.
Last weekend a warm front caused high snow levels and rain east of the crest, though less rain than west of the crest. NWAC sites east of the crest had up to an 1 inch of rain. This caused loose wet avalanches, some possible wet slab avalanches and consolidation.
Mainly mild or sunny weather has been seen so far this week at upper elevations with low clouds or fog mainly below about 3000 feet.
Recent Observations: The Mission Ridge ski patrol on Sunday reported that depth hoar at 45 cm below the surface was becoming rounded but still failed on isolation.
NWAC pro-observer Jeff Ward was at Sugarloaf Mountain a little east of Plain on Monday. He found snow cover lacking on most slopes. On a north slope inisothermal snow the buried January 15th facet/crust layers was about 12 cm below the surface and produced a SC in a test but stuck to the bed surface. Here is his video:
Several other NWAC pro-obs or North Cascade Guides reports this week in the northeast and central east zones have found the January 15th facet/crust layers at 40 cm-1 m below the surface with the facets starting to turn to rounded grains and not reactive or not releasing in pit tests. So the January 15th facet/crust layers expected in the northeast and central east zones should be strengthening and stabilizing.
NWAC pro-observer Tom Curtis was at 7500 feet on Mt Cashmere on Wednesday and found a local facet/crust combo buried on a lee slope next to a ridge crest under 35 cm of thick surface crust and 1F-P snow. This sort of slab could be hard for a skier to trigger but could be via large sudden loads such as snowmobile.