Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
410 PM EDT Mon Jul 26 2021
Valid 00Z Tue Jul 27 2021 - 00Z Thu Jul 29 2021
...Monsoon moisture continues to fuel showers and thunderstorms and a
flash flooding threat for parts of the western U.S....
...Above normal temperatures continue to impact a large portion of the
...Severe weather likely for portions of the northern Great Plains and
Upper Midwest Monday evening...
Monsoon moisture continues to fuel showers and thunderstorms across
portions of the southwestern U.S. These storms will have the potential to
produce locally heavy rainfall amounts, resulting in flash flooding.
Flash flood watches remain in effect across portions of California,
Nevada, southern Utah, and southwestern Colorado. As this moisture
streams north, shower and thunderstorm coverage is expected to increase
across the Great Basin and portions of the Northwest on Tuesday. While
widespread heavy rainfall amounts are not expected, locally heavy
accumulations resulting in flash flooding will remain a concern over the
next couple of days.
From the southwestern U.S. to southern Oregon, these storms will help to
keep temperatures at or below their seasonal averages through Tuesday.
However, temperatures for much of the remainder of the contiguous states
will remain above normal into the middle part of the week. Heat
Advisories and Excessive Heat Warnings currently cover a significant
portion of the central U.S. -- from the central Gulf Coast to central
Montana. Heat Advisories or Excessive Heat Warnings are also in effect
for portions of southern Idaho, northern Nevada, eastern Oregon, and
It expected to become a stormy afternoon and evening across portions of
the northern Great Plains and Upper Midwest. Storms that develop later
today will have significant potential to become severe, with damaging
winds and large hail expected from portions of the eastern Dakotas to
northern Minnesota, northern Wisconsin, and Upper Michigan. There is also
the threat for severe storms to develop producing damaging winds across
parts of southern Virginia and North Carolina. Storms developing across
these areas will also have to the potential to produce locally heavy
rainfall amounts resulting in flash flooding.
Showers and thunderstorms are forecast to develop once again across
portions of the Upper Midwest on Tuesday. However, the greater threat for
severe weather is expected to shift farther south into southern Minnesota
and Wisconsin, where storms producing damaging winds and hail may become a
concern. Meanwhile, locally severe storms may also develop along a cold
front dropping into the Northeast on Tuesday. In addition to those
storms, this front is expected to deliver much cooler temperatures to the
region that will continue through midweek.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php