1 Mar 2021

March 1, 2021

     YESTERDAY:

     Sunrise Sunday 06:57 Hrs. -4 with a 15-30 KPH SE wind.

     Mixed bands of cloud Sunday am.

      Stratus layer in the valley was thick, eventually started lifting.

      Difficult visibility in the alpine.

     Visibility got challenging mid mountain as well.

      Not the best day for race training.

      Sunday Feb 28, 2021. 14:00 Hrs. -3 with a 25-45 KPH South wind. +2 in the valley.


      Satellite image from same timeframe as above image.

     15:00 Hrs. Not much change. -5 with a 40-55 KPH South wind.

     Sunday 18:00 hrs. -3 with a 25-50 KPH SE wind.



Weather Observations for March 1, 2021 taken at 06:00 Hours.

2240 meters      -6, Winds were 15-20 KPH S--Horstman Hut
2180 meters      -5, Winds were 40-55 KPH SE--Whistler Peak
1860 meters      -4, Winds were 20-30 KPH SE --Rendezvous 
1835 meters      -3, Winds were 10-25 KPH SE--Round House
1650 meters      -2,  trace in 12 Hrs, trace in 24 Hrs, Base 248 cm --Pig Alley
1570 meters      -3,  0 cm in 12 Hrs, trace in 24 Hrs, Base 180 cm--Catskinner
  660 meters     +1, Valley Temp, Max temp Yesterday was +3.1, 1.0 mm of precip yesterday.


      As of 07:00 Hrs we have broken cloud and unlimited visibility.


FORECAST:

A weak cold front will push through today with a split flow bringing unsettled weather in a South Westerly flow aloft. The FL will likely rise to around 1200 meters. Mostly cloudy this am with a chance of some sunny breaks around noon. Some moisture in the split flow will bring showers sometime this afternoon. Back to overcast skies as the weak cold front pushes through by tonight. Another weak cold front will arrive Tuesday morning with sporadic flurries, overcast skies and slightly cooler temps. Yet another benign weather day Wednesday with overcast skies and a slight chance of some isolated flurries. A significant frontal band arrives Thursday afternoon with strong winds, increasing precipitation and warmer temperatures. More of the same on Saturday with hopefully some cooler temps. Guesstimates: 1-4 cm by Tuesday am, trace-2 cm by Wednesday am, 0-trace cm by Thursday am, 25-35 cm above 1500 meters by Friday am.



      GOES IR image from this am. Split Flow.


         Split flow for today will bring unsettled weather, mostly cloudy some flurries.





      South Westerly flow aloft.

         Mostly cloudy Tuesday with some isolated flurries.





        South Westerly to a Southerly flow with benign weather for Wednesday. 

              Southerly flow for Thursday with warmer temps. Wet, warm & windy.


     AVALANCHE ACTIVITY:

      No new avalanches observed on Whistler yesterday.

      No new avalanches observed on Blackcomb yesterday.


From Sea to Sky avalanche advisory:

Avalanche Summary

By Saturday, reports of natural and human triggered avalanche activity quieted down but cornices continued to be reactive to explosives size 2-2.5. Minor pinwheeling was observed on steep solar aspects in the afternoon. On Friday, storm/wind slabs were reactive to human triggers around treeline to size 1. A natural avalanche cycle up to size 3 occurred during the storm on Thursday, primarily on north to east aspects 1500 to 2000 m.

Snowpack Summary

20 cm of recent snow overlies a variety of old surfaces including facets, spotty surface hoar in wind sheltered areas around treeline, a sun crust on steep solar aspects and a rain crust below 1500 m. Upper level wind, having recently shifted northwest is likely transporting the recent snow into wind slabs in a reverse-loading pattern in exposed features at upper elevations. Older wind slabs formed by previous southwest winds may also remain reactive to human triggers.

Another weak layer buried in mid-February is composed of a crust, facets or spotty surface hoar depending on elevation/aspect, and is now down 50-80 cm. There have been no recent avalanches reported on this layer. Large triggers, such as an avalanche in motion, cornice fall, or intense loading from snow, wind and/or a rapid rise in temperature could awaken these deeper weak layers.

The mid and lower snowpack is well settled and strong in most areas.


      INFORMATION & OBSERVATIONS:

      Layered cornicing.

      Ski tourers would have had an interesting day with the visibility.

      Race training on Gandy Dancer.

      Medevac off Whistler Sunday afternoon.

     We received 1.0 mm of precip yesterday at 660 meters. 78.7 mm total for February.



FROM SEA TO SKY MIN REPORTS:

Neve Traverse: Feb 27, 2021

Equinox: Feb 28, 2021

Shovelnose Creek: Feb 28, 2021

Round Mtn Conditions: Feb 28, 2021

Cayoosh Glacier: Feb 28, 2021



VIDEOS:

Radioactive dust covers the: French Alps

Lots of Powder-Lots of Wind: Montana

Powder Picker Feb 28, 2021: David Jones



ARTICLES:

Preliminary Avalanche report on Snowmobiler killed on Tiger Peak: CAIC

The pandemic closes down Canadian Ski Operations: Can they Rebound

Experts say Covid to blame for deadliest avalanche season in years: U.S.

Avalanches still in Season--Tips on avalanche safety: Utah

Park City and Stevens Pass ski patrollers negotiate with Vail Resorts: Contract?

Snowmobiler counts blessings as stranger finds him buried: Colorado



       Submit your best avalanche photo for a pair of  Goggles March 1-31, 2021. Sea to Sky Area.

                                                    Thanks to Volkl Canada for sponsoring.

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