November 30, 2017

Issued: Thu, Nov 30, 2017 at 12PM

Expires: Sun, Dec 03, 2017

Above 2,500ft Moderate

1,800 to 2,500ft None

Below 1,800ft None

Degrees of Avalanche Danger ?

1. Low
2. Moderate
3. Considerable
4. High
5. Extreme

Avalanche Danger Rose ?

Avalanche Problems ?

Problem Details

Strong to extreme northerly outflow winds through much of November redistributed the snow available for wind transport above 4000 feet elevation. New snow starting Tuesday November 28 has been drifted into soft slab drifts up to two feet thick in the upper elevations.

Recent Avalanche Activity

Avalanches to size 2 ran October 26 with the three feet of snow which fell above the freezing line.

Recent Weather

WEATHER FORECAST for NEXT 24 HRS at 3,000 ft:
Temperature Forecast (Min/Max *F):   10/17
Ridgetop Wind Forecast (direction/mph):  SE/5-10
Snowfall (in/water equivalent): 6″ /0.6 “
WIND & TEMPERATURE
PAST 24 hours
Ferry Terminal Thompson Pass
Average Wind Speed (mph) / Direction   5/var  10 /SE
Max Wind Gust (mph) / Direction   10/NE  35 /NE
Temperature Min / Max (*F) 30 /33 5 /28

Weather Forecast:

6-8 inches of snowfall Wednesday. Clearing Thursday.

Clouds and a snowflake Saturday.

Big dump starting Sunday?

Additional Info & Media

Thompson Pass Nov 12 with avalanches from Oct 26 right side of DOT ridge

There has been termination dust on the peaks since mid-August. October 6th was the first time it stuck at Thompson Pass. The last significant snowfall was 34 inches at the end of October. This season 58 inches have been recorded having fallen.

 

SNOW HISTORY: Valdez 11/28 AM Thompson Pass 11/30 AM
24 Hour Snow / Water Equiv.  ”/” 7″ /0.7″
Storm Snow /Water Equiv.  ” /” 7″ /0.7″
Current Snow Depth 16″
November Snow / Water Equiv. ″ /” 18″ / 1.3″
Total Winter Snowfall / Water Equiv. ″ /” 65″ / 6.8″
Snowload in Valdez 0 lbs/sq. ft.

 

SNOWFALL at OTHER STATIONS:
LAST 24 HRS (10/22 AM)/STORM TOTAL (10/22-present)/STORM WATER EQUIV.:
Nicks Valley at 4200 ft (in): ” / ” / “
Upper Tsaina at 1750 ft (in): ” / ” / “
Sugarloaf at 550 ft (in): “/ ” / “
SNOW DEPTH & WATER SURVEY (10/2017) Depth Snow Water Equivalent
Milepost 2.5 Valdez  ″  ″
Milepost 18
Milepost 29 Worthington Flats
Milepost 37 Tsaina River bridge
This survey is done the first week of each month.

Weather Quicklinks:

SNOW CLIMATE ZONES:

  • coastal-zone-iconMaritime (Coastal) – from the Port of Valdez to Thompson Pass, all waters flowing into Valdez Arm and everything south of Marshall Pass.
  • intermountain-zone-iconInter-mountain (Transitional) – between Thompson Pass and Rendezvous Lodge.
  • interior-zone-iconContinental (Interior) – the dry north side of the Chugach (north of 46 Mile, including the Tonsina River).

Photo of Thompson Pass

thompson-pass-ski-runs

Interactive Map of Valdez Forecast Areas w/ Many Resource Layers (Trevor Grams)

climate-zones-topoclimate-zones-satellitegoogle-earth1

Run Map of Thompson Pass Area (Sean Wisner) (2MB download)
VAC Run Map Thompson Pass

NEWS: Our region is “one of the snowiest places on earth” – Serendipity / Rendezvous snowfall record set in 1963 <here>.

Free smart phone avalanche forecasts at: http://www.avalancheforecasts.com/

Posted in Continental Forecasts, Intermountain Forecasts, Maritime Forecasts, VAC Forecasts.
Pete Carter

Forecaster: Pete Carter