Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
412 PM EDT Tue May 21 2019

Valid 00Z Wed May 22 2019 - 00Z Fri May 24 2019

...Stormy weather continues across the Plains with cool temperatures from
California to New England...

An active weather pattern continues to repeat itself across the U.S. as
large upper-level lows periodically form over the western U.S., leading to
severe weather outbreaks over the Great Plains from time to time.  One
such system is currently intensifying over the central Plains this Tuesday
afternoon, spreading heavy rain and severe thunderstorms eastward into the
mid-Mississippi Valley.  The heavy rain and severe weather threats will
quickly diminish on Wednesday as the system weakens and moves into the
Great Lakes by Thursday.  Meanwhile, the next upper-level low will begin
to expand and move into the West Coast.  Widespread light to moderate
precipitation is expected to continue across a large section of the
western U.S. for the next couple of days.  The Sierra Nevada and the
higher elevations of the central to northern Rockies will once again see
accumulating snow.  Much of the Desert Southwest and the southern Rockies
should remain dry but windier than normal.  With considerable clouds and
precipitation under the cold upper-level lows, temperatures will remain
colder to much colder than normal across the western U.S. into the
north-central High Plains where readings of more than 30 degrees colder
than normal is forecast.

An upper-level ridge and a strong surface anticyclone will initially keep
the weather generally fine along the East Coast.  The cooler weather today
across the Mid-Atlantic will begin to warm up during the next couple of
days as some of the heat and humidity from the southeastern U.S. makes its
way northward into the Ohio Valley and the Appalachians on Wednesday.  A
low pressure system from the Great Lakes will spread some rain eastward
into the Mid-Atlantic and New England Wednesday night and Thursday, where
heavy rain is not expected.  However, as energy from the western U.S.
upper trough ejects into the central Plains on Thursday, the chance of
heavy thunderstorms will increase once again in these area by the
afternoon.

Kong


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