20 Apr 2017

April 20, 2017


    Avalanche control yesterday produced some Sz 1-1.5 20-40 cm ssl (soft slabs) in lee terrain.

    There were some areas where slabs occured in drifted snow up to 80 cm.


    Valley cloud early Wednesday morning April 19, 2017.

    Out of the moist layer.

    Still dry at 08:30 Hours.

    Frontal band did arrive quickly out of the South.

    Snowing at around 09:00 Hrs. Trace recorded at 1550 meters, 4 cm at 1650 meters by 14:00 Hrs.

    Wednesday morning.

    Visibility was challenging at times.

    Multiple cloud layers.

    Some blue near the end of the day.

Weather Observations for April 20, 2017 taken at 06:00 Hours.

2240 meters      -5, Winds were 15-25 KPH S     --Horstman Hut 
2180 meters      -5, Winds were 20-25 KPH S     --Whistler Peak
1860 meters      -3, Winds were 10-15 KPH SE   --Rendevous
1835 meters      -3, Winds were 10-20 KPH SSW--Roundhouse
1650 meters      -1, 4 cm of new snow, 8 cm in 24 hrs, 370 cm Base, RH 95%  --Pig Alley
1550 meters      -1, 4 cm of new snow, 4 cm in 24 hrs, 272 cm Base, RH 96%  --Catskinner 
  660 meters     +3, Valley Temp, Max Temp Yesterday was +7.9, 0.9 mm of Precip recorded yest

   As of 07:00 hrs this am we have broken cloud and variable visibility.


An upper level trough will move through today with mostly overcast skies and some light intermittent precipitation in a Southerly flow aloft. The FL will hover in the 1600 meter range with a slight bump in the afternoon. We should also see some breaks in the cloud as the day progresses.  Later today the flow will become West to Northwesterly and we should see the high pressure begin to build tonight. Friday will be the first dry day in a while with mostly sunny skies and some lingering cloud. The FL is expected to spike at around 2200 meters tomorrow.  An upper level trough will move in for Saturday morning with overcast skies and light precipitation with the FL starting at around 2000 meters dropping to 1400 meters by Saturday night. A weak upper level trough will bring showery unsettled spring weather to the area Sunday into early next week.
Guesstimates: 1-3 cm by Friday morning, 0 cm for Saturday morning, 5-10 cm above 1800 meters for Sunday morning, 4-6 cm above 1800 meters for Monday morning.

    GOES IR image from this am. Still bands of moisture heading our way.

    Unsettled weather for today.

    Flow will switch later in the day.

   We may only see some clearing by tonight.

    High pressure for Friday.

   Low will send cloud our way early Saturday morning.

   Moist Saturday with some breaks possible on Sunday.


    Alpine was closed again yesterday due to a building avalanche hazard.

   Snow line was rising on Wednesday.

   Catskinner weather plot 1550 meters received a trace of new from 06:30 hrs to 14:30 Hrs.

   Nester's weather plot is losing all the snow fast.


Risk and Snow Sliding go hand in hand: Maxed Out

California's Current Snowpack is larger than the Previous 4 years combined: NASA

Judge allows avalanche death case to proceed against Vail: Colorado

Skiing helps us choose how to Live: Powder

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