Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
400 AM EDT Sat Oct 30 2021

Valid 12Z Sat Oct 30 2021 - 12Z Mon Nov 01 2021

...Strong storm system will continue to bring heavy rain, gusty winds, and
coastal flooding to the East Coast...

...Scattered rain and snow showers likely from the Pacific Northwest to
the High Plains...

...Cold front to bring cooler weather to much of the Plains by Sunday...


A powerful storm system moving through the eastern half of the country
that brought heavy rains and coastal flooding to the Mid-Atlantic on
Friday will continue northeastward through the weekend. An anomalously
strong area of low pressure in the Ohio Valley will meander northeastward
with an occluded front arching around back to the south over the Atlantic
Ocean. Onshore flow from the Atlantic ahead of the front will continue to
funnel moisture westward across the Northeast and around the the system,
fueling widespread showers and heavy rain. The focus for flooding concerns
will be on New England Saturday, where a Slight Risk of Excessive Rainfall
has been issued for portions of southern Maine. Rainfall totals of 2-4
inches are forecast. A broader Marginal Risk is out for the region with
widespread totals of 1-2 inches likely. Gusty winds will also continue and
Gale Warnings are in effect along the Atlantic Coast. Coastal flooding
will remain a concern for the Mid-Atlantic as well with warnings in place
for both the coast and the Chesapeake Bay into early Sunday. More
widespread, lighter showers will continue across the Midwest, Ohio and
Tennessee Valleys, and southern Appalachians on Saturday around the
expansive storm system. Most of the showers will move out by Sunday night.
Additionally, temperatures behind the front in the South will be rather
cool for this time of year, with highs from the mid-50s across portions of
Tennessee, Alabama, and Georgia to the mid-60s along the central Gulf
Coast. A gradual warm-up is expected Sunday into Monday.

To the west, a cold front will continue to move southward through the
Plains while stalling across the Rockies and Great Basin. Scattered rain
and snow showers are likely in the Northern Rockies on Saturday, with some
showers and thunderstorms also forecast for parts of northern California
and southern Oregon. The showers will spread into the Central Rockies and
High Plains throughout the day Sunday as the cold front continues
southward. Snow showers are likely not only for the higher elevations in
the Rockies and Black Hills, but also for the High Plains into Sunday
night. Accumulations are expected to generally remain light with this
system.  After a frost this morning across portions of the Central and
Southern Plains, temperatures will rapidly warm into the upper 60s to
mid-70s, with some mid-80s possible for the Southern High Plains. However,
colder temperatures will spread southward on Sunday, with highs in the 40s
for the Northern Plains, 50s in the Central Plains, and lower to mid-60s
reaching portions of the Southern Plains.

Elsewhere, generally dry and seasonable conditions are expected for most
of California and the Southwest, stretching east into southern Texas. Some
showers are possible across the Florida Peninsula. A storm system in the
Pacific will approach the coast of the Pacific Northwest and northern
California on Sunday night with increasing rain chances.

Putnam

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