678
FXUS01 KWBC 111952
PMDSPD

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
339 PM EDT Tue Aug 11 2026

Valid 00Z Wed Aug 12 2026 - 00Z Fri Aug 14 2026

...Mid-summer heat persists from the Central Plains to the
Southeast but cooler temperatures soon for the Intermountain West
and Northern Plains...

...Severe thunderstorm and heavy rainfall threats continue across
the Plains, Midwest, Ohio Valley, and central Appalachians the
next couple of days...

The heat dome that has recently been over the Southwest is
migrating/building into the Mid-South and Southeast, setting the
stage for a long-duration heat wave. For the next couple of days,
a wavy frontal boundary from the High Plains to the
mid-Mississippi Valley, Midwest, and Mid-Atlantic will be the
focus for showers and thunderstorms which could be severe and/or
promote flash flooding. The heat dome to the south will favor
drier conditions and hot temperatures nearing daily records for
some locations -- well into the 90s to the low 100s (southern
Plains).
Dew points in the low to mid 70s will create heat index values of
105-110F for many locations. To the north of the front,
temperatures will be closer to normal for mid-August into the 70s
to mid 80s.

Over the West, a cooling trend is in store for much of the region
starting tomorrow when many areas will see below normal highs for
the first time in several days thanks to an expansive area of
afternoon showers/storms. Some storms could produce excessive
rainfall that could cause local flash flooding across the region,
but especially in southeastern Arizona. High temperatures in
Montana near the Canadian border may stay in the 60s (coolest
since June). By Thursday, the cooler air will filter into more of
the region as the heat dome exits the West entirely. Areas from
the Rockies (and northern High Plains) to the West Coast will see
temperatures 5-15F below normal which could be the coolest since
late May or early June. In addition, another day of scattered
showers/storms are likely for the Rockies/Great Basin/Southwest.

Fracasso

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




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