17 May 2021

May 17, 2021

      PAST WEEK:

     Monday May 10, 2021. 12:00 Hrs. Mix of sun and cloud. +14 Deg C at 660 m. -2 at 2180 m.

     Tuesday May 11, 2021. 12:00 Hrs. Broken cloud, mostly sunny. +18 Deg C at 660 m. +3 at 2180 m.

     Wednesday May 12, 2021. 12:00 Hrs. Overcast. +12 Deg C at 660 m. 0 at 2180 m.

      Thursday May 13, 2021. 12:00 Hrs. +18 Deg C at 660 m. +3 at 2180 m.

     Friday May 14, 2021. 14:00 Hrs. +23 Deg C at 660 m. +5 at 2180 m.

      Saturday May 15, 2021. 12:00 Hrs. +21 Deg C at 660 m. +7 at 2180 m.

      Sunday May 16, 2021. 12:00 Hrs. +21 Deg C at 660 m. +5 at 2180 m.

Weather Observations for May 17, 2021 taken at 06:00 Hours.

2180 meters     +1, Winds were 45-70 KPH S--Whistler Peak 
1835 meters     +4, Winds were  10-35 KPH ESE--Round House
1650 meters     +6, ? mm in 12 Hrs, ? mm in 24 Hrs, Base 177 cm --Pig Alley
  660 meters    +11, Valley Temp, Max temp Yesterday was +23.6, trace  of precip yesterday.

      As of 07:00 Hrs in the alpine this am, we have overcast skies, variable visibility, and raining.


An upper low will slide down the coast bringing periods of light precipitation to the area in a South Westerly flow aloft for today. A cold front will bring snow to the upper elevations later today into Tuesday. The FL will likely drop to around 1200 meters by Tuesday am. Cool moist air mass will bring a weak upper trough to the area Tuesday with a mix of sun, cloud and periods of light precipitation.  Wednesday is looking overcast with a few sunny breaks as ridging slowly moves back into the zone. . Ridge strengthens Thursday with mostly sunny skies. Ridge maintains into Friday with sunny skies, by Saturday a mix of sun and cloud. Sunday will likely see a weak front with periods of light precipitation. But that is 6 days away!! Guesstimates: 10-15 mm by Tuesday am, 4-8 mm by Wednesday am, trace- 1 mm by Thursday am, 0-trace by Friday am, 0 mm by Saturday am, 0-2 mm by Sunday am.

      GOES image from this am.

         Upper trough will bring periods of precip today, cold front will bring cooler temps.


      South Westerly flow aloft.

         Cool unstable conditions for Tuesday. May see a few sunny breaks but looking cold.

.          High slowly rebuilds but looks like a cool cloudy day for Wednesday. 

          Ridge strengthens for Thursday.

      Ridging Thursday.

      High pressure for Friday.

.       High seems to maintain for Saturday, low will likely send some clouds into the mix.

.        Low will likely be back for Sunday.


      Slide path 51 has produced on the Duffey Lake Road.                              Miller Capilano  Pic

      Two ski tourers have been killed in an avalanche in Switzerland. Article below.                Net Pic

     Ski tourer injured in a large avalanche in Switzerland. Article below.                               Net Pic

      Blackcomb Bowl. Image taken on May 10, 2021.

      May 13, 2021. Recent wet loose surface locally.

      Recent wet loose.

      Two cyclists had to be rescued after avalanches cut them off. Article below.                       Net Pic


      Mix of sun and cloud Monday May 10, 2021. High in the valley was + 16.3 Deg C.

      Mostly sunny with some high thin cloud Tuesday. High of +19.8 Deg C in the valley.

      Short wave trough pushes through early Wednesday am. Showers. 

       Wednesday am.

      07:00 Hrs Thursday May 13, 2021. +1 Deg C at 2240 m.

      Awesome day Thursday, felt more like a nice spring day. High was +21.8 Deg C.

      Mamquam Mountain Friday afternoon. High in Squamish was +23.3 Deg C.

     A few clouds around Saturday afternoon. High in the valley was +24.3 Deg C.

      Sunday afternoon, a few clouds but another awesome sunny day. High of +23.6 Deg C at 660 m.


Footage of an avalanche in Utah: Feb 22, 2021

Riding a slush avalanche: Mammoth Mountain

Slow moving wet avalanche: Scotland


Dog barks lead rescue crew to owners trapped in an avalanche: Switzerland

Two ski tourers have died in an avalanche in Switzerland. Piz Russein

Avalanches trap bikers on Going-to-the-Sun Road: Montana

Warning to outdoor enthusiasts- Avalanche season is not over yet: NSSAR

ACMG mountain conditions summary for the Coast Mountains, May 13, 2021: Andrew Councell

Ski tourer buried by an avalanche: Switzerland

Considerable avalanche danger in Colorado after May storm: CAIC

Avalanche fences above Park City gated community spark controversy: Utah

Climate drivers of large magnitude avalanche years in the U.S. north Rocky Mountains: Nature.com

As climate change thaws mountain tops, risk of rockfall surges: Washington Post

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