Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
402 PM EDT Fri Sep 10 2021

Valid 00Z Sat Sep 11 2021 - 00Z Mon Sep 13 2021

...Heatwave moves to the Plains with temperatures 10 to 20 degrees above
average...

...There is a low risk of excessive rainfall over parts of the Northwest
through Saturday morning...

...Increase in tropical moisture along the Gulf of Mexico will increase
the threat of excessive rainfall on Sunday...

Upper-level energy moving over the Northwest will aid in bringing to an
end the heatwave over the West Coast, while upper-level high moves
eastward to Southern Plains by Sunday.  Temperatures over the Plains will
be 10 to 20 degrees above average through Saturday. Record high
temperatures move into the Central/Southern High Plains with temperatures
forecast to be in the low 100s and upper 90s, cooling slightly on Sunday.

The upper-level energy will aid in producing showers and thunderstorms
over parts of the Northwest into the Northern Intermountain Region and the
Great Basin. However, there is a low risk of excessive rainfall over parts
of the Northwest through Saturday morning. Furthermore, there is an
Elevated Risk of fire weather over parts of the Northern Rockies, as dry
thunderstorms over parts of the Great Basin will increase the fire weather
threat in that region through Saturday morning. Therefore, Red Flag
Warnings are over parts of the Pacific Northwest/Northern California into
parts of the Northern Rockies.  Moreover, Air Quality Alerts up over parts
of the Pacific Northwest, Idaho, Montana, Wyoming, and Colorado due to
wildfire smoke.

Meanwhile, a front over the Northern Tier States will move to the
Northeast while trailing westward into the Central Plains by Sunday
evening.  Showers and thunderstorms will develop along and ahead of the
boundary extending from the Northeast to the Great Lakes/Middle
Mississippi Valley by Sunday.

In the meantime, tropical moisture will increase over the Western and
Central Gulf Coast starting late Saturday night.  The increase in moisture
will produce uptake in showers and thunderstorms along the Gulf Coast
through Sunday evening.  The expansion of tropical moisture will also
boost the threat of excessive rainfall over the Western/Central Gulf Coast
by late Sunday.

Ziegenfelder

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