Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
349 PM EDT Sat Oct 21 2023

Valid 00Z Sun Oct 22 2023 - 00Z Tue Oct 24 2023

...Rain from the Great Lakes to the Northeast and over the Northwest...

...Temperatures will be 15 to 20 degrees above average over the parts of
the Northern High Plains/Great Basin into the Middle/Lower Mississippi
Valley...

An upper-level low over Maine will slowly move into Southeastern Canada by
Sunday afternoon, while additional upper-level energy over the Great Lakes
moves off the northern Mid-Atlantic Coast by late Sunday night. The
upper-level energy moving around the upper-level low will produce
scattered rain over parts of the Great Lakes into the Northeast through
Monday morning. In addition, light, wet snow will develop over the highest
elevations of New York State.

Meanwhile, upper-level troughing and a weak boundary over the West will
aid in creating light rain over parts of the Pacific Northwest and
Northern/Central California overnight Saturday into Sunday. The rain ends
over California by Monday morning. Light rain develops over parts of the
Northern Intermountain Region as the upper-level trough moves farther
inland. Moreover, upper-level energy over the Northern Intermountain
Region will move to the Great Lakes by Monday. The energy will trigger
scattered rain showers over parts of the Northern/Central Plains on Sunday
that move into the Upper Great Lakes/Middle Mississippi Valley by Monday.

Further, upper-level ridging extending from the Rio Grande Valley to the
Northern Intermountain Region will slowly creep eastward into the
Middle/Lower Mississippi Valley by Sunday. The upper-level ridging will
allow temperatures to be 15 to 20 degrees above average over the Northern
High Plains/Great Basin into the Middle/Lower Mississippi Valley.

Overnight Sunday, upper-level energy moving over Texas and moisture moving
northward over the Southern Plains will aid in creating showers and
thunderstorms over parts of the Southern Plains late Sunday into Monday.


Ziegenfelder


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