Wayne Flann Avalanche Blog: December 21, 2022

AVALANCHE ACTIVITY:

Na Front Range CO, 2022/12/20. Click> CAIC Report. Matt Pearson Pic

Na Sr Snoqualmie Pass, WA. 2022/12/20 Click> PNAC Report. Craig Roberts Pic

Na Kenai Mountains, AK. 2022/12/19. Click> CNFAIC Report. Paul Wunnicke Pic

Avalanche mitigation on Blackcomb produced some Sz 1 storm slabs.

Xl (avalauncher Rounds) produced no results in Lakeside Tuesday.

Some Sz 1 Xe Xc came out of Blackcomb Bowl.

Avalanche mitigation on Whistler produced some Sz 1 Xe (explosives) Xc (cornice drops).

Sz 1.5 Xe on Saturdays. storm slab. Was hard to see!

WEATHER YESTERDAY:

Sunrise Tuesday was at 8:08 Hrs. -13 Deg C with a 35-45 KPH South wind at 2280 m.

More breaks by 10:30 Hrs. -10 Deg C with a 5-10 KPH SW wind at 1860 m.

Tuesday December 20, 2022. 12:00 Hrs. -13 Deg C with a 10-20 KPH West wind at 1835 m.

Image from same time frame as above.

14:00 Hrs Tuesday. Winter Solstice <click for facts, is today.

Just before sunset, which was at 16:11 Hrs. Only lost 1 minute of daylight yesterday.

Weather Observations for December 21, 2022 taken at 06:00 Hours.

2280 meters -21, Winds were 15-20 KPH NE--Horstman Hut

2180 meters -24, Winds were 35-60 KPH N-Whistler Peak

1860 meters -22, Winds were 10-20 KPH N-Rendezvous

1835 meters -23, Winds were 5-20 KPH NE--Round House

1650 meters -25, trace in 12 Hrs, 2 cm in 24 Hrs. Base 113 cm--Pig Alley

1570 meters -23, trace in 12 Hrs, 1cm in 24 Hrs. Base 62 cm--Catskinner

660 meters -19, Valley Temp, Max temp Yesterday was -16, 4.2 mm? of precip yesterday.

-24 with a 50 KPH wind at 2180--Wind Chill -41.

06:00 Hrs this am, looks like a trace. Base 113 cm

As of 07:00 Hrs this am we have clear skies and unlimited visibility.

FORECAST:

Arctic airmass will bring sunny skies this am in a Northerly flow aloft. Increasing cloud by the pm with overcast skies by this evening. Models are not in agreement concerning tonight, so we may see unsettled weather tonight. Thursday will be mostly overcast with dry weather, some models are calling for some flurries during the day. Friday will see some precipitation return with periods of light snow and a slowly rising freezing level. Should see snow to the valley. A more intense frontal band arrives late Friday night into Saturday with moderate/heavy precipitation and a rising freezing level. ( ?1000-1500 m) more on the FL as we get closer. Drys out Sunday with some periods of light precipitation, model disagreement here as well so sure there will be an adjustment before then. Another frontal band on tap for Monday. Guesstimates: 0 cm by Thursday am, 0-2 cm by Friday am, 25-30 cm by Saturday am, 40-50 mm by Sunday nam, 5-10 mm by Monday am.

GOES IR Image from this am.