3 Apr 2021

April 3, 2021


         Early Friday morning. Obscured on Whistler Peak.

     Patches of blue in the am.

      Isolated convective flurries in the pm.

      Sunny breaks later in the pm.

     17:00 Hrs in the Callaghan.

Weather Observations for April 3, 2021 taken at 06:00 Hours.

2180 meters      -6, Winds were 50-60 KPH SE--Whistler Peak 
1835 meters      -4, Winds were  20-30 KPH ESE--Round House
1650 meters      -4,  1 mm in 12 Hrs, 1 mm in 24 Hrs, Base 277 cm --Pig Alley
  660 meters       0, Valley Temp, Max temp Yesterday was +7.5, 0.0 mm of precip yesterday.

     As of sunrise, 06:44 Hrs we have overcast skies and it is snowing lightly in the town center.


A weak upper trough will bring periods of light precipitation in a Westerly flow aloft. A warm front pushes through this am with a trailing cold front passing through this afternoon.  The FL will spike to around 1500 meters today, dropping to 1000 meters by Sunday am. The cooling upper trough passes through early Sunday morning with a few flurries and becomes unsettled Sunday morning. Weak ridging begins with a mix of sun and cloud for most of the day. Ridge strengthens later Sunday afternoon with mostly sunny skies.  Monday is looking sunny as the ridge continues to strengthen, may see some convective cloud development later in the afternoon. Tuesday is looking nice as well with some cloud development in the afternoon. Unsettled Wednesday morning with a front arriving in the afternoon with periods of light-moderate precipitation into Thursday. Guesstimates: 8-12 cm by Sunday am, 0-trace cm by Monday am, 0 cm by Tuesday am, 0 cm by Wednesday am, 10-15 cm by Thursday am.

      GOES IR image from this am.

      A weak upper trough for today with warmish temps.

     Westerly flow aloft, likely switching to South Westerly later today.

       High exerts its strength on Sunday pushing in from the West.

       High strengthens for Monday.

.       Looking sunny on Sunday.


      No new avalanches observed yesterday in the Callaghan. Old wet tree bombs below treeline.

      Large tree bomb.

      Recent cornice release in Colorado, cornices in the Sea to Sky are very large presently.

From Sea to Sky Avalanche Advisory:

Avalanche Summary

No new avalanches were observed on Thursday. Looking forward, avalanche activity may spike during stormy conditions on Saturday and into the night.

Snowpack Summary

A storm will bring snow above around 1400 m and strong southwest wind. Around 10 to 20 cm is expected to accumulated by Saturday afternoon, forming new storm slabs in sheltered terrain and wind slabs in exposed terrain at high elevations. The snow may take a few days to bond to an underlying melt-freeze crust everywhere except on north aspects above 1600 m. Below the rain-snow line, rain will soak an already moist snowpack.

Cornices are large and looming along ridgelines. Their release is unpredictable, requiring a large berth if you're travelling above or below them.


      1960 snowmobile.

      2012 Snowmobile.

       Electric Snowmobile

     13:30 Hours.

      Convective clouds in the afternoon.


Rethel: April 2, 2021


Weekly avalanche summary down South-April 2, 2021: Montana


Unusually deadly avalanche season in Switzerland: WSL

Why an avalanche that doesn't kill you might land you in Jail: SKI

Spring weather brings new avalanche concerns to Colorado's backcountry terrain: OutThere

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