Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
201 AM EDT Sat Nov 04 2023

Valid 12Z Sat Nov 04 2023 - 12Z Mon Nov 06 2023

...Modest atmospheric river activity to bring multiple rounds of
beneficial precipitation across the Pacific Northwest and the Northern
Rockies this weekend into early next week...

...Most of the country experiences modest warmth this weekend before cool
Pacific air enters through the West...


Persistent troughing over the Pacific Northwest will generate moderate to
locally heavy precipitation across much of the Northwest this weekend into
early next week. The first round of precip will be almost completely in
the form of rain (save for highest mountain peaks) across the Washington
and Oregon coasts today. Isolated instances of heavy rainfall over the
Olympics and coastal ranges of southern Oregon into northern California
will support a Marginal Risk of Flash Flooding as a result. The next round
of precip arrives late Sunday afternoon and carries with it another
Marginal Risk of Flash Flooding over the immediate coastal areas of the
Pacific Northwest, partly due to high soil moisture caused by recent heavy
rain. Moisture from this atmospheric river activity is expected to spread
into the Northern Rockies in the form of snow showers this weekend.

Relatively zonal flow across much of the country will support above
average temperatures this weekend, while shortwave energy moving through
the Southeast will lead to average to below average temperatures. The
upper trough responsible for atmospheric river activity over the Pacific
Northwest this weekend will bring cool Pacific air into the West by early
next week.


Kebede

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