29 Apr 2017

April 29, 2017


    Old wet snow cycle, no new activity Friday.

    Old activity in Lakeside Bowl.


    Friday April 28, 2017. More cloud than sun.

    Valley cloud began to lift.

    Awesome morning with a firm melt freeze surface in the morning.

    Friday am.

    When the cloud layer lifted there were periods of bad visibility in the alpine & at tree line.

    Friday afternoon.

    ID High cornice is huge.

    Sunset was at 20:26 Hrs.

Weather Observations for April 29, 2017 taken at 06:00 Hours.

2240 meters      -7, Winds were 15-25 KPH SE  --Horstman Hut 
1860 meters      -5, Winds were 10-15 KPH ESE--Rendevous
1550 meters      -3, 0 cm of new snow, 0 cm in 24 hrs, 247 cm Base, RH 90%  --Catskinner 
  660 meters       0, Valley Temp, Max Temp Yesterday was +13.1, 0.0 mm of Precip recorded yest

   As of 06:30 Hrs this am we have a frontal band approaching from the Southwest.

   Sunrise was at 05:53 this am. Broken cloud with the approach of a cold front.


A brief reprieve early this morning before a fast moving cold front pushes through our area by mid morning in a Westerly Flow Aloft. We can expect overcast skies and light/moderate precipitation with the FL starting at just above the valley floor rising to as high as 1500 meters than dropping back down to 1200 meters with the passing of the cold front. Will be difficult to forecast snow amounts through this period!! Scattered showers for Sunday morning with a drying trend by the afternoon in a cool air mass. A weak warm front will bring cloudy conditions and some spotty light precipitation for Monday. The FL will likely rise to about 1800 meters on Tuesday. Some uncertainty into mid week but it does look warm, with the FL rising well above the local peaks.
Guesstimates: 10-15 cm by Sunday morning, 2-6 cm by Monday morning, 1-3 cm by Tuesday morning,.
Rain at all elevations beyond Tuesday.

   GOES IR image from this am.

    Early this am.

   Flow for today.

   Looks wet by noon.

   Saturday into Sunday.

    Sunday morning.

    Unsettled by Sunday afternoon.

   Some lingering moisture on Monday.

   Hopefully we will see a high pressure by mid week.


   Snow line has changed dramatically in the past 2 Weeks.

   Cornices will become fragile with the warmer temperatures.

    Winter snow on the upper North faces.


An Arc Gis-Geo-Morphological approach for snow Avalanche Zoning: Bergmo

Montana's Avalanche problems: Flathead Avalanche Center

Avalanche footage above the Ski Resort in Terskol: Russia

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