Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
350 AM EDT Wed Nov 01 2023

Valid 12Z Wed Nov 01 2023 - 12Z Fri Nov 03 2023

...Record setting cold and subfreezing temperatures to span throughout
much of the central and southern United States...

...Atmospheric River ushers in wet weather to the Pacific Northwest by
tonight...

A strong high pressure system settling over the Lower Mississippi Valley
and southern Plains will allow for frigid early morning temperatures
today. Lows into the teens and 20s are expected across much of the
central/northern Plains, Midwest, Great Lakes, and Ohio/Tennessee valleys,
while temperatures near the freezing mark sink towards the Lower
Mississippi Valley and Deep South. Frigid readings into the teens are also
likely across parts of northern Maine. These cold temperatures may break
several daily record lows between Texas and West Virginia, equating to
around 20 degrees below average. This fall chill will shift eastward on
Thursday morning, with subfreezing temperatures expanding across the
Southeast and Mid-Atlantic. The main impacts associated with the cold
conditions will be associated with a frost and/or freeze threat. Sensitive
vegetation may be damaged or killed and exposed water pipes could be
damaged if proper precautions aren't taken. A continuous area of Freeze
Warnings and Watches span from central Texas to southern Pennsylvania and
New Jersey, including much of the Deep South, Tennessee Valley, and
Southeast. Temperatures should slowly begin to moderate back to near
average by the end of the week as the aforementioned high pressure system
gradually weakens and shifts eastward.

A wet weather pattern is set to begin across the Pacific Northwest as an
Atmospheric River surges inland tonight over Washington and Oregon. Warm
Pacific air will allow for snow levels to increase and rain to fall across
most of the Cascades. A few inches of rain over the Cascades, coastal
ranges and valleys could lead to isolated instances of flooding or runoff
concerns. A Marginal Risk (level 1/4) of Excessive Rainfall has been
issued for this region through Thursday. Heavy snowfall may enter the
Yellowstone region of northwest Wyoming and southwest Montana on Thursday
as moisture continues to progress inland. Here, medium probabilities
(40-50%) for at least 4 inches of snowfall exist. The next storm system
containing another potential round of heavy rain is set to approach
northern California and Oregon on Friday night

Mostly dry conditions are expected elsewhere across the Nation. Light rain
and snow showers are possible across the Northeast and Lower Great Lakes
today as a developing low pressure system exits the western Atlantic
Ocean. Strong northeasterly flow behind a cold front could also produce
scattered showers along the eastern Florida Peninsula over the next few
days.

Snell

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