21 Dec 2018

December 21, 2018

    YESTERDAY:

    Upload at 08:30 Hours, 0 deg in the valley but FL rising.

    0830 Hours -1 at 1835 meters.

    Strong winds at 1860 meters yesterday am, 100 kph gust at 10:45 at 1860 meters. Willy Pic

    Snowing and blowing 0 deg by 10:00 hrs at 1860 meters. -1 by 12:15 Hrs. Fast spike.

   As of 11:00 hrs it was 0 Deg C at 1835 meters. 30-80 KPH winds. Max gust yesterday was 136.4.

    A few breaks in the afternoon between precipitation waves.

    Snow line had been elevated. FL at 1550 meters with the cold front was -1 by 13:45 Hrs.

    Rail Jam Thursday night, +1 Deg C as of 20:00 Hrs.

    From Yesterday morning, looks like most of the moisture has gone South.

    From same time line as above image, 09:45 Hrs.


Maximum recorded gusts yesterday:

2240 Meters 179.30 KPH at 14:00 Hrs.
2180 Meters 139.70 KPH at 12:00 Hrs.
1860 Meters 111.70 KPH at 13:30 Hrs.
1835 Meters 136.40 KPH at 13:00 Hrs.


Weather Observations for December 21, 2018  taken at 06:00 Hours.

2240 meters     -12, Winds were 25-30 KPH SE--Horstman Hut
2180 meters     -12, Winds were 20-40 KPH SSW--Whistler Peak
1860 meters     -10, Winds were 10-15 KPH SE--Rendevous
1835 meters     -10, Winds were 20-25 KPH SSW--Round House
1650 meters       -9, 5 cm of new, 17 cm in 24 hrs, Base 216 cm--Pig Alley
1565 meters       -8, 5 cm of new, 17 cm in 24 hrs, Base 150 cm--Catskinner
  660 meters       -2, Valley Temp, Max temp Yesterday was +4.6, 36.9 mm of precip recorded yest

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


FORECAST:

Weak ridging this am with unsettled weather (mostly cloudy)  in a Westerly flow aloft. The FL will remain below or just above surface. A weak frontal band will push onshore tonight with a weak warm front followed by a cold front with light precipitation. Another frontal band from an offshore low will arrive Saturday evening into Sunday with light/moderate precipitation and moderate winds. A weak ridge is forecasted for Monday into Tuesday with another weak frontal band on Tuesday evening. We may see some sun on Christmas Eve and Christmas Day. Guesstimates: 2-5 cm by Saturday morning, 15-20 cm by Sunday morning, 4-8 cm by Monday morning.


   GOES IR image from this am.



    Cooler temps with some weak ridging.








Fronts along the coast.


    Offshore low will send more snow our way. FL around 1000 meters.








     Frontal band with a mix of cooler air from the North Sunday.


    High will influence the area on Sunday with unsettled weather and colder temps.


    AVALANCHE ACTIVITY:


    An avalanche on Jones Pass CO, has injured a skier, article below.                   Dale Atkins Pic


   Snow Bike releases an avalanche near Mt Bachelor, Oregon. Article below.           DSCO Photo


    Locally, AC yesterday produced Sz 1-2 with Xc, Xe, Sc, Xl. Some Na moist activity as well.



   INFORMATION & OBSERVATIONS:


   Click here, Winter Solstice for info on the shortest day of the year. Full Moon Dec 22.  Net Pic

   Glimpses of the Mountain during the day, Max Temp at 1860 M was 0 Deg C at 10:00 -1 by 12:30.


    Municipal crews were working hard to get the drains working.

    Nester's Weather station, snow in the morning, 36.9mm of precipitation on Thursday.

    Our tax dollars do buy some nice art.


From Avalanche Canada MIN reports:

Disease Ridge avalanche: Dec 19, 2018

Blackcomb Backcountry: Dec 19,2018


From the Northwest Avalanche Center:

Several very large natural and explosive triggered avalanches occurred in the Crystal Mountain area over the last two days. These slides occurred on a deep persistent layer of buried surface hoar and facets. This same layer has been identified in most areas of the Washington Cascades. Many of these avalanches acted in surprising ways... linked multiple start zones, wrapped across multiple aspects, crossed terrain features, and ran long distances. Avalanches like these are clear signs the snowpack is weak and can fail. Make sure to check the forecast as we continue to gain more information about this dangerous avalanche problem.

Pictured: A very large explosive triggered avalanche from a NW aspect near 6600 feet. Photo: Crystal Mountain Ski Patrol








Video Friday:

Skier triggered, airbag deployed: Verbier, France

Buried facets: Montana

Ski Cut on Bridger Peak: Montana

Remote Trigger: Montana, 12-19-2018

Fog roles over the Jura Mountins: Switzerland

FLIR image of an avalanche released by Gazex: Colorado



ARTICLES:

Skier Buried and seriously injured in large avalanche in Jones PassColorado

Vehicle accidental near Mt Bachelor: Oregon

Another article on the Tree well Incident near Terrace: CBC News

High avalanche danger in Turnagain Pass: Alaska

Why KT Miller may never shoot another ski photo again: Emily Wolfe

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