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Avalanche Forecast for 2020-12-11 06:31

  • EXPIRED ON December 12, 2020 @ 6:31 am
    Published on December 11, 2020 @ 6:31 am
  • Issued by Nick Meyers - Shasta-Trinity National Forest

LOW avalanche danger continues today with normal caution advised. A fast and progressive weather pattern will send rain, snow and windy conditions our way for the foreseeable future. No big dumps yet, but it all adds up. Rocks, trees and brush are still the number one hazard. The first wave of winter weather should fire up later this afternoon and into the evening. Expect extreme wind and bitter cold above treeline on the mountain.

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.

Avalanche Problem 1: Normal Caution

  • Character ?
  • Aspect/Elevation ?
  • Likelihood ?
    Very Likely

Normal caution is advised for avalanches. Extra caution is advised for rocks, brush and small trees that are exposed or barely covered. Snow conditions are variable: wind scoured, soft(ish) and unconsolidated below treeline in wind protected areas and a variety of crusts throughout. Use safe travel techniques and bring your beacon, shovel and probe. Practice your rescue skills. Get ready for the coming snow.

Forecast Discussion

  • Winter storms will begin to impact the area over the coming weeks
  • Be prepared for winter driving conditions. The Everitt Memorial Highway can be a dangerous, icy road. Go slow. Envision grandma's fresh, frosty cupcakes are sitting on the dash. 
  • It is still going to take several good storms before early season, low tide, rocky, crunchy, brushy, snow name it...conditions fade away.
  • Rangers have witness several parties harvesting Christmas trees from the Bunny Flat area. Cutting trees along the Everitt Memorial Highway and at Bunny Flat is prohibited in most areas. Get a map and be informed.
  • As we begin to get snow and see avalanches, help us out by submitting an observation! You can do it right on our website by clicking that big blue button near the obs section. A photo, a few words, anything helps! 

Recent Observations

Snow remaining on the ground from our one and only storm for the season that blew in on November 17th:

  • Old Ski Bowl, treeline on Mount Shasta - 12 inches
  • Castle Lake - 2 inches
  • Eddies - 8 inches
  • East side/Ash Creek Butte - 14 inches

You've heard it a bunch already...early season conditions is still the mode of operation around these parts. Here is how it's looking on the big hill before the weekend storm(s).

Mt Shasta views, clockwise from top left: Shastina and the West Face view from Abrams Lake exit along I-5 /  Old Ski Bowl view from the Mt Shasta Ski Park / Avalanche Gulch from Bunny Flat. [Photo: Meyers]

Weather and Current Conditions

Weather Summary

Mother Nature has decided to ease us into winter gently. Snow is in the forecast folks, and we should begin to see the landscape turn white this weekend. This first system is not very strong, but none-the-less, a period of stormy weather is expected for the coming weeks.

Today, increasing clouds will usher in snow for later this afternoon and evening. Precipitation total for the next 24 hours is .28 inches, which could mean a couple inches of snow on the mountain. Snow levels will be near town. All of this will happen in about a 6-8 hour period tonight before snow levels come up tomorrow. Saturday will give way to a short break. That said, this progressive weather pattern we are entering will persist and another front will be pushed onshore Saturday night. Snow levels will rise to 5,500 to 6,000 feet. We should see more widespread snow with the second system and perhaps 4-6 inches of additional snow accumulation in the mountains through Sunday. Wind will be a factor with all of this. 

24 Hour Weather Station Data @ 5:00 AM

Weather Station Temp (°F) Wind (mi/hr) Snow (in) Comments
Cur Min Max Avg Avg Max Gust Dir Depth New Water Equivalent Settlement
Mt. Shasta City (3540 ft) 29 27 56 36.5 2 N
Sand Flat (6750 ft) 23 19 42 28 8 0 0 0
Ski Bowl (7600 ft) 21.5 15 40 27.5 12.4 0 0 0
Gray Butte (8000 ft) 19.5 16.5 38.5 27.5 15 67 WNW
Castle Lake (5870 ft) 25.5 21 41.5 30 2.4 0 0
Mount Eddy (6509 ft) 20 14 43.5 27.5 2 6 WSW 7.7 0 0
Ash Creek Bowl (7250 ft) 18 13.5 38.5 25 14.2 0 0
Ash Creek Ridge (7895 ft) 12.5 11 38.5 22.5

Two Day Mountain Weather Forecast

Produced in partnership with the Medford NWS

For 7000 ft to 9000 ft
(4 a.m. to 10 p.m.)
Friday Night
(10 p.m. to 4 a.m.)
(4 a.m. to 10 p.m.)
Weather Mostly cloudy with a 40% chance of snow after 10a.m. Snow level near town. Snow, breezy. Snow level near 4,200 feet. Mostly cloudy, slight chance of snow in the morning, a 50% chance of snow after 4p.m. Snow level near 5,300 feet.
Temperature (°F) 30 25 34
Wind (mi/hr) South/Southwest 5-10 South/Southwest 10-20 Northwest 5-10
Precipitation SWE / Snowfall (in) 0.15 / 1-2 0.13 / 3-5 0.15 / 0-1
For 9000 ft to 11000 ft
  Friday Friday Night Saturday
Weather A 50% chance of snow after 10a.m. Windy. Snow, heavy at times. Windy. Snow likely, mainly before 10a.m. and after 4p.m. Windy.
Temperature (°F) 19 14 30
Wind (mi/hr) West 30-40 West 40-50 Northwest 20-30
Precipitation SWE / Snowfall (in) 0.15 / 1-3 0.13 / 4-8 0.15 / 1-2

Season Precipitation for Mount Shasta City

Period Measured (in) Normal (in) Percent of Normal (%)
From Oct 1, 2023 (the wet season) 1.70 9.69 18
Month to Date (since Jun 1, 2024) T 2.33 0
Year to Date (since Jan 1, 2024) 14.61 37.69 39


This forecast does not apply to Ski Areas or Highways and is for the Mt. Shasta, Castle Lake and Mt. Eddy backcountry. Use this information for guidance only. You may find different conditions in the backcountry and should travel accordingly. This forecast expires 24 hours after the posted time unless otherwise noted.