Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
248 PM EST Fri Nov 17 2023

Valid 00Z Sat Nov 18 2023 - 00Z Mon Nov 20 2023

...Unsettled weather expands across the West...

...Great Plains warms up while the West cools down...


A southern stream trough will phase with its northern stream counterpart
as it enters the West from the Pacific this weekend. This amplifying
mid-level trough will support widespread rain showers and high elevation
snow across much of the West. Scattered showers and thunderstorms will
expand across the state of California tonight while heavy snow develops
over the Sierra Nevada. The focus for rain and snow expands into the
Pacific Northwest on Saturday as a deep low pressure system emerges over
the region. There is up to a 40% chance of 8" of snow falling over parts
of the Sierra that day. The Cascades will receive much of its snow between
Saturday and Sunday with estimates at around 6-12" for the mountain range
by Monday morning. Much of the moisture associated with this system will
spread into the Intermountain West and Rockies on Sunday where additional
snow will occur.

Parts of the Northeast coast will experience near-to-record breaking warm
low temperatures tonight, as cloudy conditions prevent surfaces from
radiating warm daytime temperatures out. The Southwest will also
experience warm low temperatures tonight, before a cool airmass moves in
on Saturday. Temperatures climb over the Great Plains beneath an area of
high pressure and out ahead of an approaching mid-level trough. Scattered
showers and thunderstorms will proliferate across the Southern/Central
Plains and Middle/Lower Mississippi Valley on Sunday, while the western
trough digs into the Rockies.


Kebede


Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php