…Above average heat expected to linger across the Ohio and Tennessee
Valleys through Friday before a cooling trend arrives by the weekend…
…Strong to severe thunderstorms expected across the upper Midwest and
Mid-Atlantic today, then across the Great Lakes on Friday…
…Some tropical heavy rain and thunderstorms could affect the western
Gulf Coast region through the next couple of days…
A vigorous low pressure system currently centered near the U.S.-Canadian
border of the High Plains will move steadily across southern Canada
through the next couple of days. Strong to severe thunderstorms forming
ahead of a potent cold front trailing south from the low pressure center
will likely impact North Dakota early this morning, before quickly
advancing into Minnesota and down across the central Plains into this
evening. These thunderstorms could develop into supercells that may
contain damaging winds, large hail, and a few tornadoes. Meanwhile,
thunderstorms across the Mid-Atlantic could also be strong to severe where
some gusty winds and heavy rain may lead to isolated to scattered
instances of flash flooding by this evening and into the overnight. The
front that helps trigger these thunderstorms will gradually edge farther
southward into the Mid-Atlantic on Friday, bringing relief from the heat
with high temperatures only reaching into the 70s for much of the
Northeast. The cool air will not have a chance to reach into the Ohio and
Tennessee Valleys though as southerly flow increases ahead of the deep low
pressure system in southern Canada. A couple more days of heat with
afternoon high temperatures well up into the 90s are expected in these
areas. Above average overnight low temperatures will provide little
relief, lows will likely stay in the 70s for much of the region. A
cooling trend will set in by the weekend behind the cold front. Scattered
thunderstorms with embedded strong to severe storms will then extend
southwestward across the Midwest into the central Plains on Friday as the
trailing end of the front begins to slow down and become nearly stationary
into the southern Plains by Saturday.
Separate from the frontal system across the northern tier of the country,
tropical moisture from the Gulf of Mexico could lead to heavy rain across
portions of the western Gulf Coast region as an upper-level low lingers
over Texas. A small scale low pressure center could form and interact
with a subtle coastal front to enhance rainfall rates, leading to the
potential for flooding issues over portions of the the western Gulf Coast
through the next couple of days.
Across the rest of the country, a general cooldown is expected behind the
cold front across the north-central U.S. and high temperatures should be
generally in the middle 80s. Much of the Southeast should be warm and
humid with commonplace high temperatures in the middle 90s. A warming
trend is expected for the western U.S. following the recent cool spell as
the strong low departs into southern Canada.
Kong/Wilder
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
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