Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
400 AM EDT Sun Oct 15 2023

Valid 12Z Sun Oct 15 2023 - 12Z Tue Oct 17 2023

...Departing deep storm will usher cooler and damp autumn weather
throughout the eastern half of the country with areas of showers lingering
over the Northeast, lower Great Lakes, Ohio Valley, and into southern
Appalachians...

...Warm and dry across much of the western U.S. but rainy conditions
continue over the Pacific Northwest...

An explosively deepening low pressure system off the coast of the northern
Mid-Atlantic early this Sunday morning will continue to move out to sea. 
Heavy rain and embedded thunderstorms associated with this system are
expected to stay offshore and move farther away from the East Coast.  In
the wake of the deep storm, much of the eastern half of the country will
be under the influence of a cool, expansive, but unstable air stream from
north.  Breezy to windy conditions are expected to prevail across a big
chunk of the central to eastern U.S. at least through Monday with areas of
rain showers that tend to linger over New England and the lower Great
Lakes where instability will be greatest due to lingering upper-level
troughing pivoting southward from eastern Canada.  Some of the rain is
forecast to push southward into the Ohio Valley and toward the southern
Appalachians with lingering cloudiness for a couple more days.  This cool
and damp weather regime should begin to break down by Monday night into
early Tuesday when winds are forecast to begin to subside and showers
begin to taper off.  Meanwhile, partly sunny conditions can be expected
along the East Coast as air sliding down the eastern slopes of the
Appalachians helps warming and drying out the cool and damp air mass
somewhat.

Meanwhile, a cool but dry couple of days are in store through the
mid-section of the country under the influence of a high pressure ridge. 
In contrast, warm and dry weather will continue through much of the
western U.S. for the next few days.  The exception will be across the
Pacific Northwest and initially near coastal northern California where
rainy and windy conditions are expected to continue.  Some of the rain is
forecast to penetrate inland into the northern Rockies late Monday into
early Tuesday as a cold front and the associated upper trough advance
toward the northern High Plains.

Kong


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