…Heavy showers and severe thunderstorms are expected to redevelop
tonight across the central Plains and nearby High Plains where flash
flooding is possible…
…Another round of heavy showers and severe thunderstorms is expected to
impact the south-central Plains and nearby High Plains Friday night into
early Saturday where flash flooding is possible…
…Tropical moisture associated with a coastal low pressure system is
forecast to bring some heavy rainfall today near the Carolina coastline
and portions of the Florida Panhandle…
An upper-level trough that has already brought heavy rain and
thunderstorms across many locations of the Southwest into the Four Corners
is forecast to weaken today. However, the weakened system is forecast to
linger over the Southwest and periodically ejects energy eastward into the
south-central U.S. where it will continue to interact with a meandering
frontal boundary. Under this weather pattern, the threat of heavy rain and
strong thunderstorms will lessen today across the Southwest into the Four
Corners as the focus of strong thunderstorms will shift into the
south-central U.S. through the next couple of days. Multiple waves of low
pressure riding northeastward up along the meandering front will
periodically trigger clusters of heavy showers and thunderstorms which
will lead to additional concerns for some flash flooding along with severe
weather.
For today, the greatest threat for severe weather is expected to be over
the southern High Plains from eastern New Mexico into portions of Oklahoma
and Texas where the Storm Prediction Center has depicted a Slight Risk
(level 2/5) of severe thunderstorms. A threat of large hail, damaging
winds and potentially a few tornadoes will exist, and especially this
afternoon and evening. A lesser threat of heavy rain and strong
thunderstorms is forecast to extend northeast across the Ohio/Tennessee
Valley and into the Northeast for the second half of today and Friday as
the front becomes slow-moving. Also on Friday, the threat of severe
weather will extent well off to the east into the Ohio and Tennessee
Valleys where a broad Slight Risk of severe thunderstorms is depicted. By
Friday night into Saturday morning, another round of potentially severe
thunderstorms and heavy rain is forecast for the south-central Plains
mainly across Oklahoma where slight risks of excessive rainfall and severe
thunderstorms are anticipated. Scattered showers and thunderstorms are
also expected farther north across the central Rockies into the nearby
High Plains through the next couple of days, as well as across the
northern Plains into the upper Midwest later today through Friday morning.
Meanwhile, an area of low pressure is developing near the coast of the
southeastern U.S. where an upper-level trough continues to interact with a
coastal front. The center of this system is forecast to track
northeastward just inland from the Carolina coastline through tonight
before moving further off the Mid-Atlantic coast Friday night into
Saturday morning. Tropical moisture lifting northward near and ahead of
the system will bring a threat of heavy rainfall and isolated to scattered
areas of flash flooding. A few inches of rainfall is generally expected
across the coastal plain before the rain moves out to sea on Friday.
Behind the aforementioned frontal zone draping from the southern Plains,
Ohio Valley and eventually the Northeast, temperatures will generally be
below normal with highs especially over portions of the Plains running as
much as 10 to 20 degrees below average for early June. Temperatures will
also be below normal over portions of the Southwest and the Southeast U.S.
where extensive cloud cover and areas of heavy rain will keep temperatures
cooler. Much above average temperatures are forecast for the Northeast
U.S. ahead of the front where some high temperatures may reach over 90s
today. Very warm to locally hot temperatures are also expected by Friday
across the Pacific Northwest and portions of the Great Basin.
Kong/Orrison
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
