27 Apr 2021

April 27, 2021


      Early Monday am.

     08:00 Hrs. + 6 Deg C at 660 m. -1 at 1650 m. -3 at 1835 m. -5 at 2180m.

     10:00 Hrs. +8 Deg C at 660 m. 0 at 1650 m. +1 at 1835 m. -4 at 2180m.

      Mostly cloudy Monday am.

     12:00 Hrs. +11 Deg c at 660 m. +2 at 1650 m. +4 at 1835 m. -3 at 2180 m.

     14:00 Hrs. +12 Deg C at 660 m. +3 at 1650 m. +2 at 1835 m. -3 at 2180 m.

     Satellite image from the same timeframe as above image.

16:00 Hrs. +12 Deg C at 660 m. +4 at 1835 m. +1 at 1835 m. -2 at 2180 m.

     18:00 Hrs. +11 Deg C at 660 m. +2 at 1650 m. +1 at 1835 m. -3 at 2180m.

     The best break was at the end of the day.

Weather Observations for April 27, 2021 taken at 06:00 Hours.

2180 meters      -5, Winds were 25-45 KPH SW--Whistler Peak 
1835 meters      -1, Winds were 20-35 KPH SW--Round House
1650 meters       0,  0.1 mm in 12 Hrs, 0.1 mm in 24 Hrs, Base 237 cm --Pig Alley
  660 meters     +5, Valley Temp, Max temp Yesterday was +13.0, 0.2 mm of precip yesterday.

     Sunrise was at 05:55 Hrs. Overcast skies and unlimited visibility.


Slow moving low and associated warm front will arrive this afternoon in a Westerly flow aloft. Increasing cloud cover this am with periods of light precipitation starting this afternoon into Wednesday am. The FL will likely hover around 1600 m but could spike up to 1800 m. Trailing cold front will likely let the FL fall to around 1200 meters by tomorrow am. Another warm front arrives Wednesday afternoon after a brief drying pattern later in the am. Periods of light precipitation for Wednesday into Thursday am with the FL well above the local peaks. Looks like it dries out again Thursday am into the evening with the chance of some sunny breaks. Another impulse of moisture for Thursday night into Friday. May dry out Saturday pm. Guesstimates: 1-4 mm by Wednesday am, 2-6 mm by Thursday am, 1-2 mm by Friday am, 4-8 mm by Saturday am.

     GOES image from this am.

      Large slow moving low moving down the coast for today. Rain by this afternoon.

      Westerly Flow aloft.

       500 MB image for today.

         Wet and warm for Wednesday.

        Weak trough with warm temps, may see drier weather on Thursday.


      Update on the avalanche in Northern India. Article below.                                                   Net Pic

      Two soldiers have died in an avalanche in the Siachen Zone. Article below.                   Net Pic

     Some activity out of Pakalolo and the Teetering's.

         Rohr Area, from MIN report below.                                                               CTConundrum Pic

From Sea to Sky Avalanche Advisory:

Avalanche Bulletin - Sea to Sky

Date Issued:

Valid Until:


We have finished writing Avalanche Forecasts for the season. Refer to our Spring Conditions page to see general guidance on backcountry travel in the spring months.

Early Season: Tue, 27 Apr

The avalanche danger is variable and can range from Low to High. Travelling early in the day is recommended, as conditions can change rapidly in short periods of time due to daytime warming. Pay careful attention to the integrity of the surface crusts formed overnight and rising air temperatures during the day. Dry slab avalanche danger may also exist during spring snow storms. Field Observations for your area may be available at the Association of Canadian Mountain Guides (ACMG) Mountain Conditions Report Website: http://www.mountainconditions.com. More Spring Conditions Details - http://www.avalanche.ca/pages/static-page/spring-conditions


     Mid mountain cloud began lifting in the am. Fresh snow in the alpine.

      08:00 +8 Deg C in Pemberton. High on Sunday was +16.7 Deg C.

      Snow line Monday am.

      Snow continues to disapear at lower elevations.

      Stayed cloudy for most of the day with some intermitent isolated showers.

      Nice light at the end of the day.


Rohr: April 26, 2021


Monitoring snow avalanches with infrasound: AGU


Two soldiers rescued from an avalanche in the Siachen District succumb to their injuries: Northern India

Uttarakhand avalanche toll rises to 15: Northern India

Why scientists are starting avalanches on purpose: Norway

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