This avalanche advisory is provided through a partnership between the Tahoe National Forest and the Sierra Avalanche Center. This advisory covers the Central Sierra Nevada Mountains between Yuba Pass on the north and Ebbetts Pass on the south. Click here for a map of the forecast area. This advisory applies only to backcountry areas outside established ski area boundaries. This advisory describes general avalanche conditions and local variations always occur. This advisory expires 24 hours after the posted time unless otherwise noted. The information in this advisory is provided by the USDA Forest Service who is solely responsible for its content.


This Avalanche Advisory was published on January 14, 2009:


January 14, 2009 at 7:43 am

Avalanche danger is LOW for all elevations and aspects. Normal caution is advised.


Forecast Discussion:


High pressure is firmly in place over the forecast area and beyond. Early spring conditions will continue to dominate the weather pattern. An air temperature inversion is in place with the coldest air below about 7,000' this morning. Above 7,000', remote sensors are reporting 6 am air temperatures in the mid 30s to low 40s deg. F. Daytime highs could possibly reach record air temperatures today in parts of eastern California.

Observations from around the forecast area continue to indicate a stable snowpack. Southerly aspects hold thin snow cover while northerly aspects have a snowpack generally 3 to 6 feet deep in near and above treeline areas. Snow surface conditions are mixed and variable. Expect melt-freeze snow in sun exposed areas and either supportable or breakable crust in other areas. Surface snow that melted yesterday is expected to have refrozen overnight due to radiational cooling, despite above freezing air temperatures in many locations.

Melting of surface snow will occur today in nearly all sun exposed areas. Once areas transition from sun to shade, expect the snow surface to begin to refreeze. It is still January and the sun angle remains low, even though air temperatures are warm. Significant areas of wet snow instability are not expected to occur today.


The bottom line:

Avalanche danger is LOW for all elevations and aspects. Normal caution is advised.


Brandon Schwartz - Avalanche Forecaster, Tahoe National Forest


Weather Observations from along the Sierra Crest between 8200 ft and 8800 ft:

0600 temperature: 41 deg. F.
Max. temperature in the last 24 hours: 48 to 52 deg. F.
Average wind direction during the last 24 hours: East
Average wind speed during the last 24 hours: 22 mph
Maximum wind gust in the last 24 hours: 43 mph
New snowfall in the last 24 hours: O inches
Total snow depth: 60 inches

Two-Day Mountain Weather Forecast - Produced in partnership with the Reno NWS

For 7000-8000 ft:

  Wednesday: Wednesday Night: Thursday:
Weather: Sunny skies. Clear skies. Sunny skies.
Temperatures: 53 to 60 deg. F. On peaks 30 to 40, on valley floors 12 to 27 deg. F. 53 to 60 deg. F.
Wind direction: NE to E E E
Wind speed: Around 10 mph. Around 10 mph. Around 10 mph.
Expected snowfall: O in. O in. O in.

For 8000-9000 ft:

  Wednesday: Wednesday Night: Thursday:
Weather: Sunny skies. Clear skies. Sunny skies.
Temperatures: 46 to 56 deg. F. 35 to 45 deg. F. 46 to 56 deg. F.
Wind direction: NE to E NE to E NE to E
Wind speed: 15 to 25 mph with gusts to 40 mph. 10 to 15 mph with gusts to 30 mph. 10 to 15 mph with gusts to 25 mph.
Expected snowfall: O in. O in. O in.