Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
400 AM EDT Fri Sep 11 2026

Valid 12Z Fri Sep 11 2026 - 12Z Sun Sep 13 2026

...Lingering front maintains unsettled weather across the Lower
Mississippi Valley, Southeast, and Mid-Atlantic...

...Northern Pacific systems usher in cool and wet weather over portions of
the Northwest and Northern Tier...

This evening, the weather map over the Lower 48 highlights a stationary
frontal boundary extending from the Ohio Valley into the Southern Plains.
While this front recently provided much-needed relief from the heat to the
Nation's midsection, this feature is expected to weaken over the next two
days as temperatures warm again across the South-Central and Eastern U.S.
In fact, a few daily high temperature records could fall in the Southern
Plains this weekend as daytime highs climb into the upper-90s and triple
digits. The increasingly warm and unstable air will also interact with the
front and a disturbance aloft to yield a broad area of showers and
thunderstorms this weekend from the Lower Mississippi Valley through the
Mid-Atlantic. Isolated to scattered heavy rainfall and flash flooding will
be the main concern with this activity, particularly with any storms
tomorrow near the Central Appalachians and the I-95 corridor from
Philadelphia to Washington D.C.

Meanwhile, the Northern Tier remains active as a pair of Pacific systems
push two well defined fronts across the Western U.S. and international
border this weekend. Portions of the Upper Mississippi Valley and Upper
Midwest are being monitored today for scattered heavy rain and severe
weather potential later this afternoon along the cold front from the lead
system. With time, however, expect the focus for thunderstorms and heavy
rainfall to shift southward toward the Central Plains this weekend with
the arrival of the leading front. Further west, the second Pacific system
is expected to pivot over the Northwest late Saturday, spreading
beneficial soaking rains across the region through the Northern Rockies.
Some mixed precipitation will even be possible Sunday morning in the
Northern Rockies beneath the base of the second system, with high
temperatures 15-20 degrees below normal expected to close out the weekend.
South of this activity, monsoon thunderstorms will continue for the next
several days over the Southwest, although coverage of storms could briefly
wane tomorrow. Even so, the potential for isolated flash flooding will
remain each day, especially over vulnerable burn scars, dry washes, or
slot canyons.


Asherman


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