Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
317 AM EDT Sat Sep 25 2021

Valid 12Z Sat Sep 25 2021 - 12Z Mon Sep 27 2021

...Isolated chances for flash flooding found across parts of Maine and the
Southwest through the weekend...

...Unsettled weather to enter the Pacific Northwest by Sunday...

...Well above average temperatures build into the central United States...

A majority of the nation will enjoy a dry autumn weekend, with
precipiation chances confined to the Great Lakes and all four corners of
the Lower 48. Starting in the east, a slow moving cold front extending
from Maine to southern Florida is expected to become quasi-stationary and
lead to scattered showers and thunderstorms. A few instances of flash
flooding will be possible today across both Maine and southern Florida,
with moderate to locally heavy rain chances lingering into Sunday across
northern/central Maine as a low pressure system develops in the Gulf of
Maine. Meanwhile, a cold front zipping through the Lower Great Lakes today
may produce scattered showers and thunderstorms that extend into the Ohio
Valley. For the western U.S., an upper-level low located off the coast of
southern California will continue funneling moisture into the Desert
Southwest. This will help spark scattered thunderstorms, a few of which
could produce intense rainfall rates and isolated flash flooding. This
weather pattern is expected to remain through at least early Monday, with
the greatest chances for rain found across southern/central Arizona and
western New Mexico. Unsettled weather is also set to infiltrate the
Pacific Northwest by Sunday as a potent cold front approaches the region.
Gusty winds and rough seas can be expected along the coasts of Washington
and Oregon as well.

After a chilly start this morning, much of the central U.S. will
experience a quick warming trend as highs soar above average this
afternoon and even more so by Sunday. High temperatures into the 80s and
low 90s throughout the Great Plains will make it feel more like the end of
August than the final weekend of September. Elsewhere, average to slightly
below average temperatures will be found across the eastern third of the
country behind a pair of cold fronts. 

Snell

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