Avalanche Advisory: Tuesday - Jan 19, 2021

THIS AVALANCHE ADVISORY EXPIRED ON January 20, 2021 @ 6:59 am
Avalanche Advisory published on January 19, 2021 @ 6:59 am
Issued by Josh Feinberg - Eastern Sierra Avalanche Center

Strong to extreme NE winds and the slight possibility of less than an inch of new snowfall this morning may lead to pockets of small fresh wind slab development, especially if expected snowfall amounts are exceeded.  Avalanche danger will remain at LOW for all elevations, but keep your eye out for small isolated fresh wind deposits on NW-SW-SE facing terrain. Triggering even a small slab could lead to a bad fall with how firm the underlying snow is and the abundance of obstacles.  

1. Low

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Above Treeline
Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

1. Low

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Near Treeline
Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

1. Low

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Below Treeline
Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
    Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
Avalanche Problem 1: Wind Slab
  • Type ?
  • Aspect/Elevation ?
  • Likelihood ?
    Certain
    Very Likely
    Likely
    Possible
    Unlikely
  • Size ?
    Historic
    Very Large
    Large
    Small

No new snow has fallen yet as of 7:00 this morning except in VA lakes, where the sensor is showing 1 inch. Strong to extreme NE winds occurred overnight, and will gradually decrease thru the day.  If negligible snowfall amounts are exceeded, small isolated pockets of fresh wind slab may develop.  If that is the case, keep your eye out for denser snow deposits on the leeward side of ridges, sidewalls of gullies and across slope depressions.  NW-SW-SE facing terrain would be most concerning.  While likely to be small, any avalanche causing a fall on a steep enough slope could have bad consequences with how firm the underlying snow is in many places and all the obstacles that exist.     

advisory discussion

The loose-wet concerns over the past few days will be non-existent today as temperatures dropped to near 0°F at 11,000’ overnight.  Temperatures will remain chilly today, and with mostly cloudy skies and strong NE winds, melt-freeze surfaces will likely remain totally frozen.  If you are travelling into exposed terrain, use caution and crampons and ice-ax/whippet are recommended.  

Weather and CURRENT CONDITIONS
weather summary

A Low-pressure system dropped temperatures significantly overnight and brought unusually strong NE winds to upper elevations, gusting up to 120mph over ridges. Expect cloudy skies with a slight chance of minimal snowfall this morning and decreasing NE winds thru the day with high temperatures reaching near 20°F around 10,000’.  

Sunshine and warmer seasonal temperatures will return for Wednesday and Thursday before a a series of low-pressure systems are lined up to bring cold temperatures and potential for more meaningful snowfall thru the end of the month, fingers crossed! 

Two-Day Mountain Weather Forecast Produced in partnership with the Reno NWS
For 8,000 ft. to 10,000 ft.
Tuesday Tuesday Night Wednesday
Weather: Mostly cloudy then becoming partly cloudy. Slight chance of snow in the morning. Snow levels below 7000 feet. Chance of precipitation is 10%. Clear. Snow levels below 7000 feet. Chance of precipitation is 0%. Sunny. Snow levels below 7000 feet. Chance of precipitation is 0%.
Temperatures: 21 to 29. deg. F. 13 to 19. deg. F. 34 to 42. deg. F.
Mid Slope Winds: Northeast 20 to 35 mph with gusts to 85 mph. East 15 to 20 mph. Gusts up to 50 mph decreasing to 40 mph after midnight. Light winds. Gusts up to 25 mph in the morning.
Expected snowfall: 100% probability up to 1 inch. | SWE = none. in. 0 in. 0 in.
Over 10,000 ft.
Tuesday Tuesday Night Wednesday
Weather: Mostly cloudy. Slight chance of snow in the morning. Snow levels below 7000 feet. Chance of precipitation is 15%. Clear. Snow levels below 7000 feet. Chance of precipitation is 0%. Sunny. Snow levels below 7000 feet. Chance of precipitation is 0%.
Temperatures: 13 to 21. deg. F. 9 to 14. deg. F. 28 to 34. deg. F.
Ridge Top Winds: Northeast 55 to 70 mph becoming east and decreasing to 40 to 55 mph in the afternoon. Gusts up to 100 mph. Northeast 30 to 40 mph becoming southeast 20 to 30 mph after midnight. Gusts up to 65 mph. South around 15 mph. Gusts up to 30 mph in the morning.
Expected snowfall: 100% probability up to 1 inch. | SWE = less than 0.10 inch. in. 0 in. 0 in.
Disclaimer
This Avalanche Advisory is designed to generally describe avalanche conditions where local variations always occur. This product only applies to backcountry areas located outside established ski area boundaries. The information in this Avalanche Advisory is provided by the Eastern Sierra Avalanche Center, who is solely responsible for its content.

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