Observation: Neffs

Observation Date
2/10/2019
Observer Name
Peter Donner
Region
Salt Lake
Location Name or Route
Neffs Canyon
Red Flags
Red Flags
Heavy Snowfall
Wind Loading
Poor Snowpack Structure
Comments
Toured Main Neffs Wednesday, Saturday and Sunday, and Porter Fork Thursday and Friday.  About 3 feet of snow fell in Main Neffs, mostly Tuesday into Wednesday, but almost a foot fell Wednesday into Thursday.  An inch or two fell Saturday night. New snow since Feb 2 has now compacted to about 2 feet.  The Feb 2 surface layer has a stout rain crust about 1/2 inch thick at lower/mid elevation.  Columns failed on isolation under this crust.  As I'm writing this at 6pm Sunday Feb 10, the winds have been continuous and gusty for over 48 hours.  In wind exposed areas at 9000 feet the drifts are over 1 foot deep, dense and heavy.
 
Hazard seemed low in the low angle wind sheltered terrain I traveled, maybe moderate to considerable in the steep lower/mid elevation wind loaded terrain.
 
NWS forecast for Main Neffs is 10 to 16 inches of snow overnight Sunday into Monday w continuous winds gusting to 40 mph.  If this verifies the hazard will be considerable in steep wind loaded terrain Monday.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Considerable

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