…Heavy rainfall and concerns for flash flooding for portions of the
Lower Mississippi Valley, Tennessee Valley and Gulf states through Friday
morning…
…A swath of freezing rain and some accumulating snowfall will impact
portions of the Midwest, Lower Great Lakes, and the Northeast…
…Much milder air with temperatures surging well above normal can be
expected through the middle of the week for much of the eastern half of
the country…
Repeated rounds of convection is expected across the south-central U.S. as
a low pressure system tracks east through the Lower Mississippi Valley
through the end of the week. Deep moisture transporting northward from the
Gulf of Mexico along with upper level support for continued lift and
instability will be conducive for moderate to heavy downpours from the
Southern Plains, Gulf states, Mississippi/Tennessee Valleys and the
Southeast. The eastward progression of this frontal boundary will be slow
so the threat for excessive rainfall and associated flooding will remain
elevated. A Moderate Risk of excessive rainfall is in effect for areas
including eastern Texas, Louisiana and southern Mississippi through
Thursday morning. The swath of precipitation will shift eastward with the
potential for training within a rich moisture environment. A Slight Risk
for excessive rainfall is in effect for portions of the Gulf states and
the Southeast Thursday and Friday.
Elsewhere, a deep low pressure system will spread Pacific moisture across
much of the Northwest leading to coastal rainfall and mountain snow for
much of the Pacific Northwest and northern California.
To the north of this system warm air advection into the Midwest and Great
Lakes will promote freezing rain and snow showers for those areas today
before spreading into the Northeast on this afternoon/evening with light
accumulations expected. The aforementioned warm air advection caused by
the emerging storm system in the Gulf Coast/Southeast and the deepening
upper low over the Southwest powering it will promote a significant
warming trend across the Midwest and East Coast through the end of the
work week. There will be a lot of snow melt across the Midwest,
Mid-Atlantic and Northeast this week with highs well into the 40s and 50s
and lows 40-50 degrees above average in many places. These anomalous low
temperatures will likely break many records, particularly east of the
Mississippi Wednesday and Thursday night.
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