You are here

Avalanche Advisory for 2013-12-07 07:19:46

  • EXPIRED ON December 8, 2013 @ 7:19 am
    Published on December 7, 2013 @ 7:19 am
  • Issued by -

The Mt Shasta area has received 3-7 inches of new, light density snow in the last 24 hours. This is our first real snow of the season and snow depth totals are not deep enough to warrant an avalanche.

Winds have been west to northwest over the past few days. One will see slightly greater snow depth totals on leeward, southerly aspects on Mt. Shasta. Winds were not as strong in the western portion of the forecast area.

 

 

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Recent Observations

Terrain:  Remember most of the terrain that we like to play on is greater than 30 degrees.  Avalanches are possible on anything steeper than 30 degrees.  Avoid cornices, rock bands, terrain traps and runout zones of avalanche paths.

Weather:  Most of our areas avalanche danger will occur 24-48 hours after a storm. We still can see persistent weak layers from time to time and we always will be sure to let you know about that!  Heed the basic signs: Wind (significant snow transport and depositions), Temperature (rain/snow/rain/snow, which in turn weakens the snowpack), and Precipitation (Snow or rain add weight and stress to the current snowpack).

SnowpackIf snow accumulates, give the snowpack a chance to adjust to the new snow load before you play on or near steep slopes (greater than 30 degrees).  Most direct action avalanches occur within 24-48 hours of recent snowfall.  Watch for obvious signs of snowpack instability such as recent natural avalanche activity, collapsing of the snowpack (often associated with a “whumphing” sound), and shooting cracks. If you see these signs of instability, limit your recreation to lower angle slopes.

Human Factor: Don’t forget to carry and know how to use avalanche rescue gear. You should NOT be skiing or climbing potential avalanche slopes without having beacons, shovels, and probes.  Only one person in a group should be exposed to potential avalanche danger at a time.  Remember, climbing, skiing, and riding down the edge of slopes is safer than being in the center.  Just because another person is on a slope doesn’t mean that it is safe.  Be an individual!  Make your own decisions.  Heed the signs of instability: rapid warming, “whumphing” noises, shooting cracks, snowing an inch an hour or more, rain, roller balls, wind loading, recent avalanche activity.


 

    Weather and Current Conditions

    Weather Summary

    In Mt Shasta City this morning at 0500, we have partly cloudy skies with a current temperature of 19F.

    On Mt Shasta (South Side): Last 24 hours...

    Old Ski Bowl - 7,600 feet, we have 3-5 inches of new snow on the ground. Snow depth total is about 6 inches. The current temperature is 4F with a high of 10F and a low of 4F.

    Gray Butte - 8,000 feet, the current temperature is 3F. Temps have ranged from 3F to 9F. Winds have average WNW at 12mph with gust 35 mph from the NW.

    Castle Lake and Mt Eddy (West side of I-5)  

    Castle Lake - 5,600 feet, the current temperature is 10F with a low of 10F and a high of 19F. Three to four inches of new snow has been recorded overnight.

    Mt Eddy - 6,500 feet, the current temperature is 7F with a low of 7F and a high of 18F. Winds have been calm, 0-5 mph out of the South with a gust to 10mph, ESE.

    THIS SEASON:  Since September 1st, we have received 2.81 inches of water. Normal is 9.4 inches, putting us at 29% of normal. For the month of December, Mt Shasta has received .23 inches of water with normal being 1.37 inches, which is 16% of normal. For the year, Mt Shasta has received 9.99 inches of water, normal is 36.73 inches, putting us at 27% of normal for 2013.

    WEATHER SYNOPSIS:

    Today we will see very cold air moving into the area through the day along with clearing skies. Tonight we can expect record low temps lowering to 0 degrees and calm winds. Tomorrow is mostly clear with light winds out of the North.  There will be a warming trend early next week then more precipitation coming Thursday afternoon.

    CURRENT CONDITIONS at Bunny Flat (6950 ft)
    0600 temperature: 10
    Max. temperature in the last 24 hours: 16
    Average wind direction during the last 24 hours: NW
    Average wind speed during the last 24 hours: 12 mi/hr
    Maximum wind gust in the last 24 hours: 35 mi/hr
    New snowfall in the last 24 hours: 3-7 inches
    Total snow depth: 3-7 inches

    Two Day Mountain Weather Forecast

    Produced in partnership with the Medford NWS

    For 7000 ft to 9000 ft
      Saturday
    (4 a.m. to 10 p.m.)
    Saturday Night
    (10 p.m. to 4 a.m.)
    Sunday
    (4 a.m. to 10 p.m.)
    Weather Partly cloudy to mostly clear Mostly clear and very cold Sunny and cold
    Temperature (°F) 9 0-5 23
    Wind (mi/hr) Northwest 13-15, gust to 22 North 10-15 North-Northeast 7-9
    Precipitation SWE / Snowfall (in) / 0 / 0 / 0
    For 9000 ft to 11000 ft
      Saturday Saturday Night Sunday
    Weather Sunny and cold Mostly clear very cold Mostly sunny and cold.
    Temperature (°F) High near -3 -4 18
    Wind (mi/hr) North 36-41 North 0 North 20-30
    Precipitation SWE / Snowfall (in) / 0 / 0 / 0

    Disclaimer

    This advisory does not apply to Ski Areas or Highways and is for the Mt. Shasta, Castle Lake and Mt. Eddy back country. Use this information for guidance only. You may find different conditions in the back country and should travel accordingly. This advisory expires on midnight of the date it was posted unless otherwise noted.