Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
223 PM EST Sun Nov 21 2021

Valid 00Z Mon Nov 22 2021 - 00Z Wed Nov 24 2021

...Heavy rain and isolated instances of flash flooding possible across
portions of eastern Florida and South Texas tonight...

...Widespread showers to stretch along the East Coast on Monday due to a
sweeping cold front, colder temperatures return with lake effect snow
possible in its wake...

...Elevated to Critical fire weather conditions in Southern California,
with wet weather returning to the Pacific Northwest late Monday...

Wet and stormy weather will remain possible across southern portions of
the Nation to end the weekend. Steady onshore flow will create the
potential for additional rounds of heavy rain across eastern Florida. As a
result, the main weather hazards associated with these downpours will be
the possibility of isolated flash flooding. Meanwhile, a cold front
sweeping through South Texas is expected to spark showers and
thunderstorms across this region as well, with isolated flooding possible.

The aforementioned cold front is also forecast to produce numerous showers
along the East Coast on Monday as it finishes its trek across the country.
Moderate to locally heavy rain is possible throughout eastern Maine before
the cold front fully clears the region on Monday night. Behind the front,
much colder temperatures and lake effect snow will make for a chilly and
blustery start to the week. Total snowfall accumulations downwind of the
Great Lakes could approach 3-6 inches across localized parts of western
New York and the eastern U.P. of Michigan.

For the western U.S., elevated to critical fire weather remains a concern
across Southern California through Monday. Gusty offshore winds and low
relative humidity will create conditions ripe for any wildfires that
develop to potentially spread uncontrollably. Red Flag Warnings are in
effect. Farther north, wet weather associated with an approaching Pacific
cold front is expected to enter the Northwest by Monday afternoon. This
system is forecast to push into the Northern Rockies on Tuesday and spread
light snow across the mountainous region. While the aforementioned cold
front traverses the Intermountain West, warm and well above average
temperatures are expected to build across the Plains. Highs are forecast
to reach into the 60s and 70s as far north as South Dakota on Tuesday.

Snell

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