Avalanche Advisory Archive Pre-2016

Date Issued:2010-12-04
Danger:2
Trend:4
Probability:3
Size:2
Problem:0
Discussion:

The National Weather Service Forecasts-

TODAY...BREEZY. SNOW...MIXED WITH RAIN IN THE AFTERNOON. SNOW
ACCUMULATION 1 TO 3 INCHES. HIGHS AROUND 34. EAST WIND 15 TO
25 MPH.

TONIGHT...RAIN AND SNOW. SNOW ACCUMULATION UP TO 1 INCH.
TEMPERATURES REMAINING AROUND 34. EAST WIND 10 TO 20 MPH.

SUNDAY...DECREASING CLOUDS. SNOW AND RAIN LIKELY...DIMINISHING
IN THE AFTERNOON. SNOW ACCUMULATION UP TO 1 INCH. HIGHS AROUND
37. SOUTHEAST WIND 10 MPH IN THE MORNING BECOMING LIGHT AND
VARIABLE.

We received quite a bit of new snow up high earlier in the week. Temperatures have been good. We have seen a fair amount of wind transport that often leads to slab instability.

Field work continues to show sensative weak layers that are being easily triggered in places.

There has been some limited natural avalanche activity already. But in places that have not seen activity there is a possibility the mousetrap has been set.

At this time danger remains Moderate.

Tomorrow and Sunday during the upcoming event the temperatures are predicted to rise. This will start to place heavy, wet snow on top of looser lighter snow which will start to build a weaker snowpack on top of several weak layers already in place. This is often refered to as an upside down snowpack.

Danger levels may rise to Considerable as the temperatures warm up to and through freezing.

We have seen continued wind transport that needs to be taken into account. This could create very sensative weak layers in places and even has the possibility to trigger natural avalanches.

It is still early season and we do not have a tremendous amount of snow yet in the starting zones. Yesterdays Mt Juneau field work showed between 100cm-165cm in our urban starting zones. If avalanches were to occur we would not expect them to be of a size that would affect the urban areas of the city.

Danger is Moderate in the Urban Avalanche Zones at this time. This is partially due to the lack of a human trigger for the avalanche.

Remember in the backcountry danger levels may be more Considerable as you add the avalanche trigger (YOU).

Tip:

Please remember this is an avalanche forecast for the urban areas in the city of Juneau Only.

If you are a backcountry traveler please make sure you have the education and the tools to make good decisions and travel safely.

Remember, No Partner, No Tranceiver, No Probe, No Shovel, No Training??? NO TRAVELING IN AVALANCHE TERRAIN!

Please join us for the second annual Southeast Alaska Snow Avalanche Workshop (SEASAW) this Saturday, December 4th at Centennial Hall in Ballroom B at 5:30-10 PM.

This is a continuing education event with presenters from all over the west coast here to help keep Juneau backcountry travelers educated and safe.

There is a door prize raffle with give aways from Smith, Da Kine, Hestra, and a seasons pass on the Mt Roberts Tramway!

For those of you looking for basic Avalanche Awareness Training there is a free course the following Saturday, Dec. 11th from 9-4pm. For more information and to sign up please call (907)586-0419