26 Feb 2021

February 26, 2021

      YESTERDAY:

      Early Thursday am, dry snow.

      Snowing in the valley Thursday am.

     Patches of blue in the am, strong winds--55+KPH winds at around 09:00 Hrs.

      Nice snow mid mountain out of the early am gusts.

     Winds were moderate in the alpine, with some decent visibility.

      Nice snow below the treeline.


      Thursday Feb 25, 2021. 14:00 Hrs. -6 with a 20-40 KPH SSW wind. +2 in the valley. Snowing.

      Satellite image from same timeframe as above image.


     Snowing in the alpine Thursday afternoon.


      Yet another awesome day.


Weather Observations for February 26, 2021 taken at 06:00 Hours.

2240 meters      -11, Winds were 10-20 KPH NW--Horstman Hut
2180 meters      -10, Winds were 10-20 KPH N--Whistler Peak
1860 meters      -10, Winds were   5-10 KPH ESE --Rendezvous 
1835 meters      -10, Winds were   5-15 KPH WSW--Round House
1650 meters      -10,  3 cm in 12 Hrs, 5 cm in 24 Hrs, Base 257 cm --Pig Alley
1570 meters        -9,  1 cm in 12 Hrs, 2 cm in 24 Hrs, Base 188 cm--Catskinner
  660 meters        -2, Valley Temp, Max temp Yesterday was +1.3, 6.7 mm of precip yesterday.


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


FORECAST:

An upper ridge of high pressure will bring mostly sunny skies for today in a Northerly flow aloft. A mix of sun and cloud this am with sunny skies by this afternoon. The FL will likely go up to 800 meters, dropping back to surface tonight. Unsettled weather for Saturday morning with a weak warm front pushing over the ridge bringing an increase in cloud by the afternoon, with periods of light snow Saturday evening into early Sunday morning. Sunday is looking like a relatively dry cloudy day with a frontal band arriving Sunday night into Monday. Models are inconsistent for next week but looks like we will see more snow for Tuesday into Wednesday. Guesstimates: 0-trace by Saturday am, trace-2 cm by Sunday am, 4-8 cm by Monday am, 15-20 cm by Tuesday am.  


      GOES IR image from this am.


       Ridging for today with unsettled weather Friday am, sunnier in the afternoon. Seasonal temps.





      Northerly flow aloft.  Could see 40-60 KPH Mountain top winds.

        Unsettled for Saturday.





                Mostly dry with cloudy skies for Sunday. Front arrives Sunday night.


P


     AVALANCHE ACTIVITY:

An avalanche has killed a ski tourer in Swift Creek, Valemont, B.C. Article below.     AC PIC


      From the last storm, slab avalanche on Spire Headwall, Ipsoot Area.                   Rob Rainer Image

      Different perspective of Spire Headwall avalanche.                                                 Rob Rainer Pic

      Another view of the avalanche released by boot packers behind Spearhead Ridge.          CR Pic

      Thanks to Chuck Ratzlaff for these images from February 24, 2021.

      Looks Sporty!!                                                                                                    Chuck Ratzlaff Pic

      Avalanche mitigation on Blackcomb yesterday produced some Sz 1 soft slabs Sc.

      AC on Whistler yesterday produced Sz 1-1.5 storm slabs Xe, Xc, Sc. Some cornices went Sz 1-2.

From Sea to Sky avalanche advisory:

Avalanche Summary

Explosive control work near Whistler produced storm slabs up to size 2 on Thursday. Storm slabs are expected to remain reactive to human triggers on Friday, especially in wind affected terrain.

Snowpack Summary

Storm slabs formed by 20 cm. of new snow and extreme east/southeast winds have formed touchy storm slabs that are expected to remain reactive to human triggers; especially in wind affected terrain.

The new snow buried a variety of snow surfaces including wind pressed snow in the alpine, sun crusts on solar aspects, and a spotty layer surface hoar in some sheltered treeline areas. The kind of layer that the new snow buried will affect how long slabs will 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 50-80cm. 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 can awaken these deeper weak layers.

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


      INFORMATION & OBSERVATIONS:

      Lots of wind transport Thursday am.

      Visibility was challenging at times yesterday.

     Blowing snow on Horstman Glacier.

     Like icing on a cake.

      Nice dry snow to the valley before the FL went up.



FROM SEA TO SKY MIN REPORTS:

Beta Lake Avalanche: Feb 24, 2021

Cloudburst Mashed Potatoes: Feb 25, 2021


VIDEOS:

Ruby Mountain Accident Video: Colorado

Avalanche Control: Snoqualmie Pass

Highways Avalanche Control: Colorado

Powder Picker Feb 25, 2021: David Jones


ARTICLES:

Ski Tourer was killed in an avalanche on Feb 23, 2021: Valemount, B.C.

MIN report on the Avalanche fatality at Swift Creek ^: Avalanche Canada

Avalanche near Valemount claims a life after transceiver signal fails: Swift Creek

Cranbrook SAR rescues an avalanche victim: E-Know.ca

Report details what led to Idaho avalanche that killed a snowmobiler: SAC

Food for Thought--On slopes above 25 degrees, Think: WildSnow

How climate change may influence deadly avalanches: Scientific American


        Submit your best avalanche photo for a pair of  Goggles Feb 1-28, 2021. Sea to Sky Area.

                                                    Thanks to Volkl Canada for sponsoring.

No comments:

Post a comment