Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
436 AM EDT Sun Apr 05 2020

Valid 12Z Sun Apr 05 2020 - 12Z Wed Apr 08 2020


...California...Great Basin...North-Central Rockies....

Days 1-3...
A closed low off the CA/OR border will become cutoff as it drifts
south off the CA coast through Monday night then shift east toward
the southern CA coast through Tuesday night. This system is on the
heels of the previous trough which brought heavy mountain snows
across northern California mountains Saturday. While the previous
trough is tracking to the northern Rockies as it weakens tonight,
this low becoming cutoff will drift south. Ample Pacific moisture
ahead of this low will stream into CA, spreading to southern CA by
Monday. Snow levels are expected to be 4000 to 5000ft in this
plume with the heaviest snows shifting south from the Shasta
Siskiyous and CA Cascades this morning and down the entirety of
the Sierra Nevada through Monday morning. Heavy snow shifts to the
southern CA Ranges (most notably the San Gabriel/San Bernardinos
with snow levels 5000 to 6000ft) Monday through Tuesday as the low
lingers offshore. Storm Totals of 2 to 5ft are likely for the
Sierra Nevada with isolated amounts of 2 to 3 ft for the highest
Transverse Ranges in southern CA.

For Days 1-3, the probability of significant icing (0.25-inch or
greater) is less than 10 percent.

Jackson