Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
324 PM EST Thu Nov 26 2020

Valid 00Z Fri Nov 27 2020 - 00Z Mon Nov 30 2020

Days 1 to 3...

...Southwest U.S...
 
For Friday and Saturday, the latest models are in very good
agreement in developing an upper low which will swing east over
the Four Corners region and then out into the southern High Plains
by Saturday night. The system overall will be rather
moisture-starved, but is expected to yield locally a few inches of
snow over the higher terrain of the central and southern Rockies,
with areas as far west as northern AZ seeing some light
accumulations.

...Pacific Northwest...

A shortwave trough will brush the Pacific Northwest Friday night
and Saturday and bring a weak cold front in across the WA
Cascades. Sufficient onshore flow is expected for locally several
inches of snow in especially the northern WA Cascades going
through early Saturday.

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

Orrison