December 6, 2017

Issued: Wed, Dec 06, 2017 at 8AM

Expires: Sat, Dec 09, 2017

Dangerous Avalanche Conditions: Avoid Avalanche Terrain

Above 2,500ft Extreme

1,800 to 2,500ft Extreme

Below 1,800ft High

Degrees of Avalanche Danger ?

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

Avalanche Danger Rose ?

Avalanche Problems ?

Problem Details

Since December 2, Thompson Pass has received  nearly 40 inches storm snow with more than 6 inches water equivalent. Upper elevations and start zones are rapidly loading with sustained southeasterly wind.

Recent Avalanche Activity

Large to very large avalanches in many areas.

Recent Weather

WEATHER FORECAST for NEXT 24 HRS at 3,000 ft:
Temperature Forecast (Min/Max *F):   23/31
Ridgetop Wind Forecast (direction/mph):  NE/10-25
Snowfall (in/water equivalent): 15-33″ /2.1 “
WIND & TEMPERATURE
PAST 24 hours
Ferry Terminal Thompson Pass
Average Wind Speed (mph) / Direction   0-5 /var  23 /SE
Max Wind Gust (mph) / Direction   9 /E  38 /SE
Temperature Min / Max (*F) 32 /37 25 /29

Weather Forecast:

Within continued onshore flow, expect heavy snow and rain through Friday.

Additional Info & Media

 

SNOW HISTORY: Valdez 12/6 AM Thompson Pass 12/6 AM
24 Hour Snow / Water Equiv. 14”/2.1″ 12″ /?″
Storm Snow /Water Equiv. [12/2-pres]  28″ /6.05″ 40″ /?″
Current Snow Depth 26″ 50″
December Snow / Water Equiv. 28″ /6.12″ 42″ / 4.4+″
Total Winter Snowfall / Water Equiv. 93″ /14.93” 107″ / 9.9+″
Snowload in Valdez 65 lbs/sq. ft.

 

SNOWFALL at OTHER STATIONS:
LAST 24 HRS (12/6 AM)/STORM TOTAL (12/2-present)/STORM WATER EQUIV.:
Nicks Valley at 4200 ft (in): 39!?” / 59!?” / ?”
Upper Tsaina at 1750 ft (in): 30″ / 34 +rain” / 3.5+”
Sugarloaf at 550 ft (in): 13+”/ 27+” /?”
SNOW DEPTH & WATER SURVEY (12/2017) 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