5 Dec 2019

December 5, 2019

    YESTERDAY:

    Wednesday December 4, 2019. 12:00 Hrs. -2.4 Deg C with a 15-45 KPH SE wind.

    Early in the am.

    16:30 hrs.

    Wednesday afternoon.

    Big picture on Wednesday.



Weather Observations for December 5, 2019 taken at 06:00 Hours.

2240 meters      -9, Winds were calm KPH  N--Horstman Hut
2180 meters      -6, Winds were calm KPH N--Whistler Peak
1860 meters      -7, Winds were calm KPH SE --Rendevous 
1835 meters      -7, Winds were  5-10 KPH SE--Round House
1650 meters      -7, 1 cm in 12 Hrs, 2 cm in 24 Hrs, Base 40 cm --Pig Alley
1565 meters .    -6, ? cm in 12 Hrs, trace in 24 Hrs, Base   8 cm--Catskinner
  660 meters      -2, Valley Temp, Max temp Yesterday was +5.1, 5.5 mm of precip yesterday.

Will update amounts later.

    As of 07:00 Hrs this am we have mostly clear skies and unlimited visibility. A few scattered clouds.


FORECAST:

A weak upper level ridge will be pushed out by the low off the coast in a Westerly flow aloft. Mostly cloudy skies with light precipitation beginning later in the afternoon and continuing into Friday morning. The freezing level will slowly rise to around 1500 meters by tonight.  A weak  upper through develops for Friday afternoon as the low moves further South, with another frontal band on Friday evening bringing more precipitation into early Saturday. Hopefully the FL will hover below the 1500 meter range.  Drying trend Saturday with a ridge developing for Sunday with cooler temperatures. Guesstimates: 8-12 cm by Friday morning, 8-12 cm by Saturday morning, 2-4 cm by Sunday morning.


    GOES IR image from this am. Green looks good!!!


     Low to our South will send a weak warm front at us this evening.





    Fronts along the coast.

        Low backs off a bit but another weak frontal band comes onshore Friday evening.






    Weakening low on Saturday, ridge rebuilds Sunday.


    AVALANCHE ACTIVITY:

    Recent avalanche in Utah, Click > Jaws



    INFORMATION AND OBSERVATIONS:

    Blue holes Wednesday morning.

    It was white at times.

    Nice visibility around noon.

    High in the valley was +5.1 Deg C.



Avalanche Canada MIN reports:

Recent observations : Dec 3, 2019

 Local backcountry observations: Dec 4, 2019


Local Avalanche Activity:

Report of some Sz1 loose dry on steep terrain.
A few Sz 1 storm slabs yesteday with explosive mitigation.
Ski cut (Sc)  Sz 1 40-50 cm storm slab down to 19-11-23 MFcrFc Layer




ARTICLES:

Glossary of Avalanche Terms: Avalanche Canada

Avalanche safety for snowshoers: Snowshoe Magazine

185 avalanches recorded in Colorado last week: Denver

More info on the avalanche at Vail Pass that buried a person: November 28th

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