FOUS11 KWBC 200711
QPFHSD

Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
311 AM EDT Tue Oct 20 2026

Valid 12Z Tue Oct 20 2026 - 12Z Fri Oct 23 2026

...Southern Sierra Nevada...

Days 2 & 3...

A closed low off the Southern CA coast will tap into moisture 
originating from the tropical East Pacific and direct it northward 
into the Sierra Nevada both Wednesday and Thursday. The Sierra 
Nevada also reside beneath a potent 120kt+ jet streak that will 
provide upper-level ascent aloft in addition to the 
topographically-induced ascent that supports upslope-enhanced 
precipitation rates. The lack of a sufficiently cold air-mass and 
the closed low opening up upon approach on Thursday will confine 
the heaviest snowfall to be above 10,000ft, although some 3-6" 
amounts could occur as low as 9,000ft. The Probabilistic
Precipitation Portal (PPP) depicts moderate-to-high chances 
(40-70%) for snowfall totals >8" and low chances (10-30%) for 
snowfall >12" at elevations above 10,000ft through Thursday night. 
The WSSI-P does show high chances (>70%) for Minor Impacts (winter 
driving conditions, use caution while driving) and low-to-moderate
chances for Moderate Impacts (hazardous conditions, closures and 
disruptions possible) above 9,000ft. The lower SLRs (topping out 
between 10-11:1) will make for generally a heavy, wet snowfall in 
the Sierra Nevada.


Mullinax



$$
--- MultiMail/DOS
 * Origin: capitolcityonline.net * KY, USA (618:250/10)