The Nation’s Weather

…Severe Weather and Flash Flooding expected over the
Ohio/Tennessee/Mississippi Valleys today; Mid-Atlantic/Northeast
tomorrow…

…Above average temperatures across southern tier states; below average
temperatures across the northern tier…

After an active 48 hours of severe weather and heavy rainfall over the
nation’s midsection, well defined low pressure is forecast to shift
unsettled weather eastward into the Ohio/Tennessee/Lower Mississippi
Valleys today, and Mid-Atlantic/Northeast tomorrow. Per the Storm
Prediction Center, the forecast remains on track for an Enhanced Risk
(level 3/5) of severe thunderstorms, where tornadoes (some strong),
scattered to widespread damaging winds, and isolated significant severe
hail are all on the table through tonight as storms form ahead of a
sweeping cold front. Excessive rainfall rates and periodic cell training
within the same storms should also support isolated to scattered instances
of flash flooding across much of the same area today, where a Slight Risk
(level 2/4) of Excessive Rainfall is in effect. By tomorrow, moist soils
in the Mid-Altantic/Northeast will support a Slight Risk (at least 15%) of
Excessive Rainfall as several rounds of storms are expected. A more
unstable environment to the south will allow for increased thunderstorm
activity and the potential for isolated severe storms along the
Southeast/Mid-Atlantic Coast.

Upper troughing over southern Canada and the northern tier of the U.S.
will allow for a cooler airmass to park over the region through late this
week. High temperatures in the 40s and 50s will be 20-35 degrees below
average for parts of the Northern Plains and Upper Midwest today and
tomorrow. Meanwhile, a quasi-zonal, ridge-like pattern over the southern
tier will supply ample warm air into the region over the next few days.
Widespread high minimum temperature records may be tied or broken across
the Southeast and Southern California over the next couple of nights.

Asherman/Kebede

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