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Avalanche Forecast

Mar 14th, 2013–Mar 15th, 2013
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: South Rockies.

Precipitation amounts vary a lot throughout the region. Be aware of conditions that are specific to your area and make observations continuously as you travel.

Confidence

Fair - Forecast snowfall amounts are uncertain on Friday

Weather Forecast

Thursday night and Friday: Enhanced precipitation are expected over the region with the low pressure tracking over the region tonight. Freezing levels will start to drop (1700 m.) bringing the snow line lower. Light to moderate amounts are expected until Friday and will taper off becoming light during the day. Moderate to strong winds should switch from the SW to the W.Saturday: Unsettled conditions without any frontal systems bringing very light precipitation,moderate to strong W winds, mainly cloudy skies and freezing levels near 1500 m.Sunday: Similar pattern as Saturday with cooler temperatures and lighter winds.

Avalanche Summary

A natural avalanche cycle happened yesterday at all elevation and on all aspect up to size 3 in the Lizard Range region. Suspect similar cycle in the South Rockies region where precipitation amounts were similar.

Snowpack Summary

The warm storm has left a significant amount of wet precipitation or heavy snow (10-30 cm of heavy snow above 1800m. and rain under).  At higher elevations, snow has been transported by strong SW and W winds creating windslabs that are probably very touchy. Below the freezing line, the snowpack is rain soaked. Another pulse of precipitation is forecasted, adding weight onto the storm slab and the already moist/wet snowpack.  The new snow has not been bonding well to the underlying surfaces creating natural avalanche activity and showing signs of instability like cracking around skis.  Some of the significant underlying surfaces mentioned before include a suncrust on S aspects and a melt-freeze crust on all aspects below 1700 m.

Avalanche Problems

Storm Slabs

Warm and wet storm has created and is going to keep developing storm slabs, new wind slabs lee of strong SW-W winds in the alpine, wet slab and loose avalanches at lower elevations.
Be alert to conditions that change with elevation.>Minimize exposure to overhead avalanche terrain, as large avalanches may reach the end of runout zones.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 1 - 6