Avalanche Forecast
Issued: Jan 30th, 2013 10:06AM
The alpine rating is Wind Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Fair - Timing or intensity of solar radiation is uncertain
Weather Forecast
A ridge of high pressure looks to be dominating the pattern for the next few days. Weak systems embedded in the flow will bring light amounts of precipitation and a mix of sun and cloud on Thursday. By Friday the ridge brings sunshine and rising freezing levels.Thursday: Snow amounts 5-10 cm accompanied by moderate-strong ridgetop West winds. Alpine temperatures near -1.0 with freezing levels rising 1300 m. Friday: Mainly sunny with some upper cloud. No precipitation and ridgetop winds blowing light from the SW. Alpine temperatures rising to 2.0 degrees with freezing levels around 2100 m. Saturday: Mainly sunny possible clouds in the afternoon and no precipitation. Ridgetop winds light from the SW. Alpine temperatures near 2.0 and freezing levels rising to 2200 m.
Avalanche Summary
No new avalanche observations reported.
Snowpack Summary
Up to 30 cm of snow fell over the past few days with light to moderate NW winds. This snow is settling and gaining strength although lingering wind slabs are possible behind ridges and ribs and have proven to be touchy to rider triggers. The new snow has buried a variety of surfaces including old wind slabs, crusts and surface hoar crystals which can be found in sheltered terrain below treeline. Changing winds from the West should be strong enough to transport snow - this will create a new series of wind slabs, primarily on easterly and southerly facing slopes and in cross-loaded terrain features.The most recent buried crust/surface hoar interface is down approx. 10-30 cm, and seems to be slightly touchy in isolated sheltered areas where the surface hoar had a chance to form. Down deeper sits another surface hoar layer (40-80 cm) which seems to be gaining strength with little to no recent reactivity on it. Below this sits a generally well settled mid pack, which may be bridging a basal facet/crust layer in deeper snowpack areas. The average snowpack depth at treeline is near 170 cm.
Problems
Wind Slabs
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Jan 31st, 2013 2:00PM