…There is a Slight Risk of severe thunderstorms over parts of the Upper
Mississippi Valley and Northern/Central Plains on Saturday and over the
Upper Great Lakes and Upper/Middle Mississippi Valley on Sunday…
The leading low pressure system is tracking from the Great Lakes/Northeast
region today through Sunday. Showers and thunderstorms are developing
along and ahead of this system from the Mid-Atlantic to the Northeast as
well as the Great Lakes region. South of the front, upper-level impulses,
daytime heating, and ample amounts of moisture will develop showers and
thunderstorms over the Southeast, Tennessee Valley, and Gulf Coast. The
Storm Prediction Center has a Slight Risk in effect for portions of the
northern Mid-Atlantic and the Northeast for severe storms and WPC has much
of the same area in a Marginal Risk for Excessive Rainfall and local flash
flooding concerns.
A second low pressure system will be tracking through the Northern Plains
and Upper Mississippi Valley. Scattered to widespread convection is
expected ahead of and along the approaching fronts through Monday. The
environment will be conducive for severe thunderstorms to develop across
the Northern/Central Plains and portions of the Upper Mississippi Valley.
The Storm Prediction Center has a Slight Risk in effect through Sunday
morning and WPC has much of the same area in a Marginal Risk for Excessive
Rainfall and local flash flooding concerns. The hazards associated with
these thunderstorms are frequent lightning, severe thunderstorm wind
gusts, hail, and a few tornadoes. However, there will be an increased
threat of hail two inches or greater over Minnesota. Additionally, weak
onshore flow and upper-level energy will produce scattered showers over
parts of the Pacific Northwest.
Campbell
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
