Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
400 AM EDT Fri Sep 23 2022

Valid 12Z Fri Sep 23 2022 - 12Z Sun Sep 25 2022

...First taste of autumn is being ushered into the eastern U.S. today and
into the weekend as blustery northwest winds from the outer edge of Fiona
brushes Maine on Saturday...

...Monsoonal moisture lingers across parts of the Desert Southwest with
some additional flooding potential...

A surge of cool Canadian air behind a strong cold front will continue to
herald in the first taste of autumn weather for nearly all of the eastern
U.S. to end the week.  High temperatures will easily be 15-25 degrees
cooler compared to recent days, which will equate to widespread 60s and
70s during the day, and 40s and 50s at night as the large surface high
settles in.  Some frost will even be possible for some of the inland
valleys of the central and northern Appalachians with clear skies and
light winds, and also for northern Wisconsin and northern Michigan where
freeze warnings are in effect.  Meanwhile, Hurricane Fiona currently
passing west of Bermuda is forecast to make landfall over the Canadian
Maritimes Saturday morning as it transforms into an exceptionally intense
extratropical cyclone.  Blustery northwesterly winds are expected to be
the strongest across Maine on Saturday with rough seas near the coast. 
The winds are expected to diminish by Sunday morning when the cyclone is
forecast to rapidly weaken and move farther away.  In contrast to the
autumn feel along the East Coast, heat and humidity will remain in place
across the Florida Peninsula where the front is expected to stall into the
weekend.  Meanwhile, temperatures will likely be above average across most
of the Plains going into the weekend, with highs reaching into the mid to
upper 90s for much of Texas and Oklahoma.

In terms of precipitation, some light to moderate rainfall is expected
across the Dakotas and into the upper Midwest as a low pressure system
crosses the region and brings moisture northward, but nothing too heavy is
currently expected at this time.  Scattered to numerous showers and storms
will remain across mostly eastern Arizona and northern New Mexico through
tonight with threat of heavy rainfall gradually diminishing.  Showers and
storms are also expected to persist for central and southern Florida with
moisture convergence south of the stalled front.  Elsewhere, rip currents
generated by powerful Hurricane Fiona will remain a problem for much of
the East Coast through the end of the week.

Kong/Hamrick



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