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Shooting cracks and small wind slabs easily triggered above treeline
Location Name:Old Ski Bowl
Date and time of observation:Sat, 02/16/2019 - 2:30pm
Observation made by:Forecaster
Red Flags:Recent avalanche activityWhumphing noises, shooting cracks, or collapsingRecent loading by new snow, wind, or rain
96067 Mount Shasta , CA
United States41° 21' 49.5144" N, 122° 11' 45.5568" W
- Easy to initiate shooting cracks on small test slopes above treeline, east facing, 8200 feet.
- Small wind slabs were easily triggered on the same slopes, also east facing
- A very large (D4) avalanche was reported from Avalanche Gulch. The slide is estimated to have occurred during the Feb 13th avalanche cycle. Initial report of debris 30+ feet deep, broken trees and with a terminus at 7,200 feet. This avalanche likely ran serveral miles and thousands of vertical feet. Potentially a historic avalanche. Official investigation tomorrow.
- Below treeline, southerly aspects hit by warm sun resulting in thin zipper crust
- Near and above treeline, moderate and gusty winds out of the west/southwest were observed all day
- New snow depths vary from 8 inches to 2 feet on top of 2/11 crust layer. New snow fist hardness
- A lot of blowing snow observed today. Leeward drifts were DEEP. Firm snow could be quickly followed by soft, hollow drifts.
- Snow showers in the AM with partial clearing in the PM.
- West/Southwest wind switching to northwest
- cold and chilly, but felt warm below treeline during the middle of the day.
- High temp: 21 @ 3pm - 8,000 feet
Cloud Cover:75% of the sky covered by clouds
Accumulation rate:Less than 1 in. per hour
Air temperature:Below Freezing
Air temperature trend:Static