Reported Saturday, February 14, 2009 at 5:55 AM

Weather Forecast

Today:
Snow 3-6" possible, Southwest winds 10-20 mph with gusts to 30 mph. High Temperatures in CB and Gunnison in the mid 20's.

Tonight:
Partly Cloudy with lingering snow showers T-2" possible, West northwest winds 5-10 mph and Low Temperatures in CB in the single digits and in Gunnison around zero.

Tomorrow:
Partly Cloudy, west winds 5-10 mph, with a High temperature for CB and Gunnison around 30.

Weather Outlook

Next system arrives today on a somewhat favorable west / southwest flow. The national weather service is not to impressed with this current system but with a combination of a favorable jet stream, a mid day cold front passage, and decent orographics we should see some accumulations today. Looks like a period of heavy snow possible for mid afternoon today but not very long lived. Watch for clearing on Sunday with the next system moving in Monday night and Tuesday.

Danger Rating

Elevated Caution

CONSIDERABLE Near and Above Tree Line on North through Southeast Aspects.
MODERATE with Pockets of CONSIDERABLE Above Tree Line on Northwest through South Aspects. MODERATE everywhere else.

Avalanche Problem #1

Wind Slab  
Moderate
LIKELIHOOD OF TRIGGERING
 
Smaller
AVALANCHE SIZE
 
Increasing Danger
Trend

With low density snow available for transport and more snow coming today we should expect wind slabs to develop on Lee aspects today. With Southwest winds expect North through East aspects to be most suspect today, especially above tree line in wind exposed areas and below ridge tops and cornices.

In the Backcountry

The main concern currently is in the new snow or storm snow that has fallen since Sunday Feb 8th. Totals are between 10-20 inches around the Elk Mountains so far. Since then wind data has shown enough wind to transport snow though observers have been noticing surprisingly little slab formations in the new snow. Small natural and triggered slides have been observed, all small shallow wind slabs and/or point releases in very exposed ridge top locations. The mid pack currently is generally strong with lingering crusts on southerlies and some old buried weak layers on northerlies that are mostly non reactive at this time. Areas that have slid earlier this season remain shallow with weak faceted grains with a building slab on top of it. A skier triggered slab yesterday outside of Aspen was 2' deep on the ground from this same situation. The current snow surface is low density snow which is very available for wind transport and we should expect wind slabs to continue to develop today. With more snow and wind in the forecast expect the danger to rise through the weekend.

Travel Advisory

Backcountry travelers today need to take caution and watch for areas of wind deposited snow and slab formations. Approach steep starting zones with caution and watch for signs of wind slabs such as cracking. The snow has been slowly pilling up and lee deposits can be quite deep. Even though the last couple of days have been mostly stable with un-cohesive new snow, be aware of what the wind does today and the potential for wind slabs developing quickly today. Use good travel techniques, communicate well with your partners, and ask yourself "what are the consequences of a slab avalanche on the slope in question"?

Reported by: Rankin