Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
400 PM EDT Sat Jul 29 2023

Valid 00Z Sun Jul 30 2023 - 00Z Tue Aug 01 2023

...A cold front will bring an end to the heat across the Ohio Valley, the
Northeast and the Mid-Atlantic but severe thunderstorms and heavy rain can
be expected to move through these areas into tonight...

...Triple-digit heat continues across the southern half of the Plains to
the eastern Gulf Coast while cool and unsettled weather continues across
the northern Plains toward the Midwest...

...Monsoonal rainfall will become more widespread across the Desert
Southwest and into the Four Corners region while dry conditions persist
over the Pacific Northwest...

During the next couple of days, a broad trough of low pressure aloft over
eastern Canada is forecast to dip well into the eastern half of the
country.  This trough will bring with it a large dome of cool air from
Canada behind a well-defined cold front.  The arrival of the cool air will
bring welcome relief from the heat across the Ohio Valley to much of the
Northeast and into the Mid-Atlantic by Sunday.  However, prior to the
arrival of the cool air, the cold front will trigger strong to severe
thunderstorms along with locally heavy downpours which may be accompanied
with gusty winds and/or squalls as they move through the aforementioned
areas from west to east through tonight.  Much cooler air together with
fair weather can be expected to arrive behind the front on Sunday for
these areas and again on Monday but with the cooler air dipping even
farther south into the Carolinas.  On the other hand, the cool air will
not push as far south across the mid-section of the country, with
triple-digit heat continues across the southern half of the Great Plains
to the eastern Gulf Coast.  To the north of the front, relatively cool and
unsettled weather is expected to continue across the northern Plains
toward the Midwest, where rounds of thunderstorms can be expected
especially over the northern High Plains for the next couple of days. 
Florida will remain hot with typical summer-time showers and thunderstorms.

Over the southwestern portion of the country, increasing southerly flow
aloft is forecast to spread monsoonal moisture farther north from the
subtropics and Mexico.  Showers and thunderstorms can be expected to
become more widespread across the Desert Southwest and into the Four
Corners region through the next couple of days, and the rain will have a
tendency to spread farther north into the central Rockies by Monday. 
Meanwhile, dry conditions are forecast to persist over the Pacific
Northwest under the protection of an upper-level ridge prior to the
arrival of the next upper trough from the eastern North Pacific. 
Temperatures will be warmer than normal over the Intermountain region but
near or below normal closer to the West Coast.

Kong


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