891
FXUS01 KWBC 200811
PMDSPD

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
400 AM EDT Sat Jul 20 2024

Valid 12Z Sat Jul 20 2024 - 12Z Mon Jul 22 2024

...A break in the heat continues for much of the eastern
two-thirds of the country but heat will intensify in the interior
Pacific Northwest through this weekend...

...Scattered thunderstorms continue across the South and Southeast
as monsoonal thunderstorms linger across the Four Corners region...

...Scattered thunderstorms over the central Plains today will
gradually shift in the southern Plains by Monday while a cold
front will bring new rounds of thunderstorms across the northern
tier states...

A cool air mass settling in across the eastern two-thirds of the
country will offer an extended reprieve from the heat through the
next few days.  Afternoon high temperatures will only reach into
the 70s and 80s today from the northern and central Plains
eastward through the Atlantic coast with the exception of the
Sunshine State and the coastal plain of Georgia and South Carolina
where highs will remain in the 90s.  Texas will have highs into
the 90s to near 100 this afternoon but will cool down into the 70s
and 80s by Monday.  In contrast, the heat across the western U.S.
is expected to persist, with high temperatures once again
exceeding 100 degrees across much of the region.  The interior
Pacific Northwest will feel the heat intensify, with afternoon
readings possibly reaching 110 degrees at the hottest locations by
Sunday afternoon along with little overnight relief.  Daily highs
across the Southwest will generally hover in the 110s. Please
continue to practice heat safety in this persistent and prolonged
heat wave in the western U.S. through the next couple of days.  A
Pacific cold front will approach the West Coast on Monday,
lowering the heat only slightly for inland sections.

The upper level pattern will be slow to change across the lower 48
through the next few days. A nearly stationary front will remain
draped across the South and into the Mid-Atlantic region, keeping
the cooler air north of the boundary and the warm, moist air to
the south. The front will also help focusing and triggering
scattered thunderstorms from the Gulf Coast to the Southeast
through the next few days.  For the Southwest/Four Corners region,
monsoonal moisture will continue to support on-and-off
thunderstorms through the weekend.  These storms will keep an
elevated threat for isolated to scattered flash flooding and
severe weather, which may result from the strongest of the storms.
 Meanwhile, scattered thunderstorms over the central Plains today
will gradually shift into the southern Plains by Monday as a weak
low pressure wave slowly digs southward.  Across the northern tier
states, a cold front arriving from central Canada will bring new
rounds of thunderstorms from the northern Plains through northern
New England during the next couple of days.

Kong


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