28 Nov 2017

November 28, 2017


    AVALANCHE ACTIVITY:

    Cornice debris from cycle on Sunday morning.

Recent Avalanche MIN Report: Whistler Slackcountry-Nov 26


    YESTERDAY:

    There were some brief breaks in the morning.

    A few periods of light flurries during the day. 1 cm recorded at 1660M, a trace at 1550 M.

    Mostly overcast for a majority of the day.

    Valley cloud moved in as the day progressed as well.


Weather Observations for November 28, 2017 taken at 06:00 Hours.

2180 meters    -7, Winds were 50-100 KPH S --Whistler Peak
1835 meters    -5, Winds were 25-60 KPH SE --Roundhouse
1660 meters    -3, 6 cm of new, 7 cm in 24 hrs  Base 132 cm --Pig Alley
  660 meters   +2, Valley Temp, Max Temp Yesterday was +3.3, 0.0 mm of precip recorded

Maximum gust at 2240 meters this am was 140 KPH.

   As of 07:00 Hrs this am we have obscured skies, limited visibility and it is snowing.


FORECAST:

A vigorous cold front will bring moderate snowfall to the area this am in a Southwest flow aloft.
Precipitation will ease off this afternoon with light snow and the freezing level descending from 1000 meters to surface by this evening. Wednesday will be overcast with some very light snowfall as a weaker front pushes through with a FL hovering in the 1000 meter range. More precipitation is expected Wednesday night into Thursday with a slightly higher FL of 1200 meters. As of now there is a short lived drying trend early Friday before a series of more active frontal bands push through Friday and Saturday with seasonable freezing levels.  Long range there is some discrepancy in the models with the GFS & NAM forecasting a moist Northwesterly flow, while the European model being drier in a Northerly flow with some Arctic influence by Sunday.
Guesstimates: 10-15 by Wednesday morning, 8-12 cm by Thursday morning, 12-18 cm by Friday morning.

    GOES IR image from this am.

    500MB GFS image for this am.


    Front will ease by this afternoon with light snowfall.

    Weak frontal band for Wednesday.

    Another vigorous front for Friday night into Saturday.


OBSERVATIONS & INFORMATION:

    Debris from Sunday morning event still visible.

    Area where the crust is exposed on North aspects at 1800 meters.

     Crust is supportive in some areas and breakable in others. Many areas where it is still exposed!

    Recent snow profile.

    Fine image of Monday afternoon.

    Front moving onshore Monday afternoon.

    Big picture Monday.

    Always interesting to see where the snowline lies.



ARTICLES:

Climbers caught by two avalanches on Aonach Mor: Scotland

Caught in an Avalanche-Jeremy Jones reflects on his experience: Snowboarding Transworld

Avalanche Airbag Practise Rig: Wildsnow.com

Snowfall warning for Whistler: Environment Canada

No comments:

Post a comment