Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
204 AM EDT Wed Apr 10 2024

Valid 12Z Wed Apr 10 2024 - 12Z Sat Apr 13 2024

For day 1, the probability of significant snow is less than 10
percent.

...West Coast...
Days 2-3...

An upper low current nearing the Gulf of Alaska will drop
southeastward paralleling the coast of British Columbia Thursday as
its cold front brings in some moisture to the PacNW. With snow
levels up to about 5000ft, light snow will be mainly confined to
the Olympics and WA Cascades day 2. By day 3, the upper low and
surface cold front will continue down the coast, eventually
spreading moisture into Northern California then into the northern
Sierra. Snow levels will start quite high -- 9000ft or so -- then
slowly fall to around 6000-7000ft in the Sierra by the end of the
period (12Z Sat) and to around 5000ft over the
Shasta/Siskiyous/Trinity mountains. WPC probabilities for at least
6 inches of snow are low at this time -- generally less than 30
percent. Additional snow is forecast beyond this period.


For days 1-3, the probability of significant icing is less than 10
percent.


Fracasso