18 Apr 2017

April 18, 2017


   Avalanche control yesterday produced Sz 1 soft slabs (ssl) with Sc (ski cut). Loose dry and wet              surface sluffs on steep alpine terrain.

    Cornices continue to grow and are being trimmed almost daily. Large debris in the alpine bowls.


    Early Monday morning, light rain at 700 meters April 17, 2017.

    Snow line was at 1300 meters.

    Snowing at 08:30 Hours. From 06:30 Hrs to 14:30 Hrs 6 cm was recorded at 1550 meters.

    Nice turns to be had in the am.

    Visibility was challenging at times.

    Monday morning, different format than the image below.

    Monday morning.

    There were some breaks in the afternoon.

    And there were some periods of snow also.

    Awesome conditions in the alpine when you could see.

    Snow line did climb during the day.

    Dry later in the afternoon.

Weather Observations for April 18, 2017 taken at 06:00 Hours.

2240 meters      -2, Winds were 20-35 KPH S   --Horstman Hut 
2180 meters      -3, Winds were 25-40 KPH S   --Whistler Peak
1860 meters      -2, Winds were 15-25 KPH SE--Rendevous
1835 meters      -1, Winds were   5-15 KPH SE--Roundhouse
1650 meters       0, 10 cm of new snow, 14 cm in 24 hrs, 365 cm Base, RH 92%  --Pig Alley
1550 meters       0, 11 cm of new snow, 17 cm in 24 hrs, 276 cm Base, RH 98%  --Catskinner 
  660 meters     +3, Valley Temp, Max Temp Yesterday was +6.7, 8.0 mm of Precip recorded yest


A weakening stationary upper low off the coast will continue to send frontal bands our way in a Southwesterly flow aloft. We can expect unsettled conditions today with the FL rising to 1700 meters than dropping to 900 meters by Wednesday morning. There is a chance of a break in the frontal bands tonight into early Wednesday morning with a very weak ridge. Convective clouds today will bring periods of snow fall into tomorrow.  A more vigorous frontal band arrives Wednesday with moderate precipitation and the FL hovering below the 1600 meter range. By Thursday afternoon we should see the influence of an upper level ridge with unsettled conditions, strengthening Thursday night into Friday. There will still be some lingering cloud on Friday but for the most part a warm dry day. Enjoy the day because another weak frontal band arrives for Saturday with warm temperatures and light precipitation.
Guesstimates: 6-12 cm by Wednesday morning, 10-15 cm by Thursday morning, 1-3 cm by Friday morning.

   GOES IR image from this am.

   Weak frontal band for today, with some breaks. More breaks by this evening.

   Stronger frontal band for Wednesday.

    Wet Thursday morning with a high pressure beginning to build for the afternoon.

    High pressure with some cloud for Friday.

   Long range model--Another frontal band Monday into Tuesday.


   Winter like conditions yesterday morning.

   1550 meters (Catskinner) received 6 cm, 1660 meters (Pig Alley) recorded 4 cm yeterday pm.

    Lots of debris in all the bowls.

    Moist clouds in the valley.

    Not much snow left at Nester's weather station.


Avalanche hits near Tsunte, Dagestam: Surprises Herders

Ski Tourer injured by large avalanche in Southern Alps: Pistehors.com

Taft Conlin's death in Vail Avalanche may had to do with signage: Denver Post

Search for two men suspended due to avalanche danger: Olympic National Park

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