23 Apr 2021

April 23, 2021

     YESTERDAY:

      08:00 Hrs. +5 Deg C at 660 m. +2 at 1650 m. 0 at 1835 m. -4 at 2180 m.

     10:00 Hrs. +13 Deg C at 660 m. +4 at 1650 m. +1 at 1835 m. -4 at 2180 m.

     12:00 Hrs. +15 Deg C at 660 m. +6 at 1650 m. +2 at 1835 m. -3 at 2160 m.

      Not such a bad day!!!

     14:00 Hrs. +15 Deg C at 660 m. 

      Cornices are still on the radar.


      Satellite image from 20:30 Hrs. 

      Whistler Bowl just before sunset.



Weather Observations for April 23, 2021 taken at 06:00 Hours.

2180 meters      -4, Winds were 20-25 KPH SSW--Whistler Peak 
1835 meters      -1, Winds were 10-15 KPH SSW--Round House
1650 meters      -1,  0 mm in 12 Hrs, 0 mm in 24 Hrs, Base 233 cm --Pig Alley
  660 meters      -1, Valley Temp, Max temp Yesterday was +16.4, 0.0 mm of precip yesterday.


      Surise 06:02 Hrs. High thin scattered cloud to the NE Unlimited visibility.


FORECAST:

A weakening high will bring a mix of sun and cloud this am in a Northerly flow aloft. A weak warm front will bring cloud to the area later this am with light precip beginning this afternoon around 15:00 Hrs. The upper flow will switch to Southerly sometime this afternoon. The FL will gradually climb to around 1800 meters, dropping back down to 1200 meters tonight?. An upper trough will bring light precipitation for Saturday continuing into Sunday. Weak ridging for Monday will see a mix of sun and cloud. Another weak front arrives for Tuesday with periods of light precipitation. Welcome back to Spring.             Guesstimates: 1-4 mm by Saturday am, 12-16 mm by Sunday am, 2-4 mm by Monday am, 0-trace mm by Tuesday am, 2-6 mm by Wednesday am.


      GOES image from this am.


        High is weakening and retreating to the West. Low moves down the coast.






      Northerly flow aloft this am, switching later in the day to Southerly.

       Trough pushes through Saturday with light precip and seasonal temps.



        More of the same for Sunday.




      AVALANCHE ACTIVITY:

      Old cornice collapse on Overlord. No new avalanche activity observed yesterday.



From Sea to Sky Avalanche Advisory:

Avalanche Summary

No new avalanche reports in this region since last weekend. In the neighboring South Coast Inland, a large wet slab was reported up to size 3 and ongoing wet loose avalanches have occurred up to size 2. 

Last weekend, multiple large to very large wet slab avalanches were observed near Whistler, size 2-4. Many of these involved the full depth of the snowpack, running to the valley bottom.

 

As the weather pattern changes and the temperatures drop a decline in natural avalanche activity is likely. However, solar slopes and weak cornices remain suspect when the sun is shining. It can really pack a punch this time of year, even for short periods of time. 


     INFORMATION & OBSERVATIONS:

      Another nice morning in Pemberton. +3 Deg C at 07:00 Hrs. High Wednesay was +24.1 Deg C.



      Clouds were scarce!!

      13:00 Hrs. -2.5 Deg C at 2180 m.

      False Face.

      Lower Cruiser. Lower elevation sun exposed slopes are melting quickly.

     Fissile.

      West Cirque


FROM SEA TO SKY MIN REPORTS:

No new MIN reports as of 07:00 Hrs this am.


VIDEOS:

Avalanche near Everest base camp: April 2021


ARTICLES:

Spring Avalanche Drama (and how to avoid it): WildSnow

Induced glide-snow avalanches with low friction geotextiles: EGU

No comments:

Post a Comment