Mammoth Basin Snowpack Summary - 2015-03-27 07:05

THIS ADVISORY EXPIRED ON March 29, 2015 @ 7:05 am
Avalanche Advisory published on March 27, 2015 @ 7:05 am
Issued by Sue Burak - Inyo National Forest
Avalanche Character 1: Loose Wet
Loose Wet avalanches occur when water is running through the snowpack, and release at or below the trigger point. Avoid very steep slopes and terrain traps such as cliffs, gullies, or tree wells. Exit avalanche terrain when you see pinwheels, roller balls, a slushy surface, or during rain-on-snow events.

Rapid warming is an obvious signs of instability. When the snowpack is subject to a rapid warming, it can become very wet and unstable, increasing the stress on the overall snowpack. Rollerballs, point releases, and sloughs are all signs of rapid warming. Seek shaded slopes or cooler aspects if you are sinking into the snow past mid boot top.

recent observations

Traveling through subalpine forests above Horseshoe Lake today revealed over a meter (39") of snow in most areas. The graupel and rimed crystals were still present but under a thin layer of rounded, moist grains that have been hit by strong March sun. Test results were higher in the snowpack than Tuesday, on small, loose rounded facets below a thin melt freeze crust about 10 inches down from the surface. A compression test failed higher in the snowpack and subsequent compression tests did not produce any results.

A few small loose wet slides occurred below rock bands on the Mammoth Crest. After a cold Wednesday night, north facing slopes retained most of the soft storm snow from Monday.

CURRENT CONDITIONS Weather Observations Between June (10,000 ft.) and Mammoth (11,000 ft.)
0600 temperature: 30 deg. F.
Max. temperature in the last 24 hours: 44 deg. F.
Average wind direction during the last 24 hours: SW-NE
Average wind speed during the last 24 hours: 20 mph
Maximum wind gust in the last 24 hours: 43 mph
New snowfall in the last 24 hours: 0 inches
Total snow depth: inches


Two-Day Mountain Weather Forecast Produced in partnership with the Reno NWS
For 8,000 ft. to 10,000 ft.
  Friday Friday Night Saturday
Weather: sunny clear a few coulds
Temperatures: 57 deg. F. 38 deg. F. 54 deg. F.
Wind direction: SW SW SW
Wind speed: 5-15 15-25 25
Expected snowfall: 0 in. 0 in. 0 in.
Over 10,000 ft.
  Friday Friday Night Saturday
Weather: sunny clear clouds
Temperatures: 50 deg. F. 30 deg. F. 45 deg. F.
Wind direction: SW SW SW
Wind speed: 10-15 15-25 15-25
Expected snowfall: 0 in. 0 in. 0 in.

This snowpack summary applies only to backcountry areas outside established ski area boundaries. This snowpack summary only describes general avalanche conditions and local variations always occur. This snowpack summary expires 24 hours after the posted time unless otherwise noted. The information in this snowpack summary is provided by the USDA Forest Service who is solely responsible for its content.

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