April 11, 2023

      AVALANCHE ACTIVITY:

      Avalanche control on Blackcomb produced Sz 1-2 Xe, Xh. Storm Slabs.

      Sz 2 out of Boxing Day & Hanaka. 

      Sz 2 XH S-Turn basin.

       Sz 2 out of Boney Basin & S-Turn Basin Xh. 

      Boney Basin Debris.

      Cornice debris from Regulator. Xe

      Sz 2 Lakeside Xh 2023/04/10. Xy Sz 2. Na Sz 2 during storm.

      Different perspective of Lakeside Centre Fracture Lines.

      Avalanche control on Whistler produced Sz 1-2 Xe, XL, Xt, Xh, Sc.

      Flute Main, Xh

       Different Perspective.

      Many avalanches.

      Sz 2 Storm Slab Sun Bowl.

      Sun Bowl

       Sz 2 Storm slabs Flute Area. Xh.

      Stauchwall<click for explanation.

      Na Sz 2  moist slab Lower Disease ridge, ran in storm. 36-48 Hrs old.

      Glide Crack on Robertsons.

       Sz 1.5 Sa Lazy Boy, Pemberton Zone. 2023/04/10. MIN report below.         John Gill Image

      WEATHER YESTERDAY:

      Sunrise Monday was at 06:29 Hrs. -6 Deg C with a 10-15 KPH SE wind at 1835 m.

     08:00 Hrs. -6 Deg C with a 5-10 KPH ESE breeze at 1860 m.

     10:00 Hrs. -4 Deg C with a 10-20 KPH SE wind at 1835 m.

      Monday April 10, 2023. 12:00 Hrs. -3 Deg C with a 5-10 SE breeze at 1835 m.

      14:00 Hrs. -3 Deg C with a 10-15 KPH ESE wind at 2280 m.

     16:00 Hrs. -2 Deg C with a 0-5 KPH North breeze at 1860 m.

Weather Observations for April 11, 2023 taken at 06:00 Hours.

2280 meters     -9, Winds were 25-35 KPH S--Horstman Hut

2180 meters     -7, Winds were 35-45 KPH S--Whistler Peak

1860 meters     -7, Winds were 10-20 KPH SE--Rendezvous  

1835 meters     -7, Winds were 10-20 KPH ESE--Round House

1650 meters     -5, 3 cm in 12 Hrs, 3 cm in 24 Hrs. Base 275 cm--Pig Alley

1570 meters     -4, 2 cm in 12 Hrs, 2 cm in 24 Hrs. Base 178 cm--Catskinner

  660 meters    +1, Valley Temp, Max temp Yesterday was +6.1, 0.0 mm of precip yesterday.

Freezing level spiked briefly to around 1750 m, with +1 at 1650 m on Monday pm.

      As of 06:00 Hrs 2.4 mm in the precip gauge. 3 cm of new snow. Base 275 cm.

     As of 07:00 Hrs this am we have overcast skies, variable visibility and snowing lightly.

FORECAST:

Weak frontal band this am with some light precipitation in a Southwesterly flow aloft. Should see some sunny breaks this pm. The FL is hovering in the 1000 m range and could go up to 1400 m? dropping back to around surface tonight.  may hold at 1000 m. Ridging for Wednesday with sunny skies. Frontal band for Thursday with periods of light precipitation. Dirty ridging for Friday with a mix of sun and cloud. Upper trough will bring several frontal bands for Saturday into Monday. Guesstimates: 4-8 cm by Wednesday am, 0 cm by Thursday am, 1-4 cm by Friday am, 0-trace cm by Saturday am, 12-18 cm by Sunday am above 1600 m, 25-35 cm above 1600 m by Monday am. 

      GOES IR IMAGE from this am.

      WINDY IMAGE 2023/04/11. 05:00 Hrs.

        Tuesday will bring an upper low bringing cool temperatures and some precipitation.

      Periods of light precipitation on Tuesday.

       Southwesterly flow aloft.

       Ridging for Wednesday, sunny skies and just below average temperatures.

      Dry sunny day on Wednesday.

        Frontal band for Thursday with periods of precipitation, seasonable temperatures.

      Periods of light precipitation on Thursday.

        Dirty ridging for Friday. Mix of sun and cloud. Seasonable temperatures.

      Dry day Friday.

.       Frontal band on Saturday with above average temperatures.

     Vigorous front for Sunday.

      INFORMATION AND OBSERVATIONS:

     08:15 Hrs. upload.

      Dry morning.

      A few breaks in the am.

      There were good turns to be had.

      Helicopters used on both mountains for avalanche control. Xh.

      Mostly overcast on Monday.

      Busy spot on Whistler Monday pm. Medievac and prepping for a Slush Cup

      Always good to read the signs.

      17:00 Hrs Monday.

       Profile 2023/04/10. S Turn Basin.

     Debris from Xh in S turn Basin. Profile above from near start zone.

FROM AVALANCHE CANADA:

Travel and Terrain Advice

Be especially cautious as you transition into wind affected terrain.

Avoid lee and cross-loaded terrain.

Seek out sheltered terrain where new snow hasn't been wind-affected.

Minimize your exposure time below cornices.

CONSIDERABLE--SEA TO SKY ADVISORY available top right sidebar.

LOCAL MIN REPORTS:

Lazy Boy Avalanche: April 10, 2023

Heaps of Heavy Snow: April 9, 2023

SHORT CLIPS:

Recent avalanche of many: Annapurna

Jumping into an: Avalanche

Avalanche Control: Dry Snow

Air Time: Everyone

ARTICLES:

Guides among six killed in Armancette Glacier avalanche: France

Mountain Conditions Report, April 11, 2023: Harrison Hut

Wet slab avalanche is a sign of things to come: Colorado

UDOT closes highways because of avalanche threat: Utah

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