Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
227 PM EST Fri Nov 26 2021

Valid 00Z Sat Nov 27 2021 - 00Z Mon Nov 29 2021

...Strengthening storm system to produce heavy snow and gusty winds across
portions of the Interior Northeast and northern New England through
Saturday...

...Atmospheric River to generate moderate-to-heavy rainfall in the Pacific
Northwest beginning Saturday afternoon...

...Critical fire weather located across Southern California and parts of
the central High Plains through this evening...

The first true taste of winter this season is set to impact the Interior
Northeast and northern New England tonight as a low pressure system
rapidly intensifies over the Gulf of Maine. More than 8 inches of snow is
likely to fall across the Adirondacks, Green, and White Mountains, as well
as parts of northern Maine. Localized amounts over 1 foot are possible
here. Meanwhile, lower elevations from Upstate New York to Interior
Downeast Maine may also see a few inches of snow. Gusty winds will also
accompany the winter weather and lead to low visibility and difficult
travel conditions. Light snow is forecast to gradually come to an end
Saturday night. Winter Weather Advisories and Winter Storm Warnings have
been issued. With cold air locked in place across the Northeast, a
separate area of low pressure entering the Great Lakes on Saturday and
eventually the northern Mid-Atlantic on Sunday could spread a swath of
light snow from Michigan to northern Pennsylvania. Additionally,
temperatures are expected to remain below average across the entire East
Coast this weekend. For the Southeast, Freeze Warnings and Frost
Advisories are in effect tonight along the Gulf Coast and inland from
southern Mississippi to Georgia.

On the opposite side of the Nation, yet another Atmospheric River event
has taken aim at the Pacific Northwest. Heavy rain and a warm subtropical
airmass will lead to very high snow levels across the Olympics and
Northern Cascades between late Saturday afternoon and Sunday. Rainfall
totals of 2 to 4 inches, with locally higher amounts, are forecast and
will have the potential to cause rapid runoff and flooding concerns. Much
of this region has experienced above average precipitation over the last
month, leaving terrain more susceptible to flooding. Flood Watches and a
Slight Risk (level 2/4) of Excessive Rainfall has been issued for Saturday
across northwest Washington.

Elsewhere, continued strong offshore wind and low relative humidity has
led to another day of critical fire weather conditions across Southern
California. Critical fire weather and Red Flag Warnings have also been
issued across parts of the Central High Plains. Upper level ridging over
the western U.S. responsible for the aforementioned fire weather
conditions will also lead to above normal temperatures and downsloping
wind throughout the Plains. The only exceptions will be across Texas,
where an upper level low entering from northern Mexico will help produce
showers over much of the Lone Star Sate on Saturday.

Snell

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