Weather Wednesday June 26 2024 T-storms in the evening over NE... Dry west coast Heavy rains Midwest

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.Heat wave focus shifts to the Southeast, Mid-South, and
central/southern Plains into midweek...
...Severe storms and flash flooding possible for portions of the Upper
Midwest into Monday night, shifting a bit south Tuesday...
...Monsoon-like conditions persist for the Southwest/Four Corners Region...
A broad upper-level ridge building over the west-central U.S. will
continue to produce potentially hazardous heat over the next few days.
Forecast high temperatures will continue to soar into the upper 90s across
much of the Plains and Mississippi Valley and into southeastern parts of
the Lower 48, with low 100s possible over the central Plains. When
combined with the humidity, heat index values may reach as high as 110,
prompting Heat Advisories and some embedded Excessive Heat Warnings.
Meanwhile, low temperatures will mostly remain in the mid- to upper 70s,
bringing little relief from the heat overnight. The arrival of this more
intense heat early in the Summer season leads to a higher level of
heat-related stress, especially for those outdoors and without reliable
air conditioning available. While the north-central U.S. can expect some
relief from the heat Tuesday and especially Wednesday behind a cold front,
the Southern Plains to Mid-South to Southeast will maintain potentially
dangerously hot conditions through the period, with a brief period of heat
returning to the Middle Mississippi/Ohio Valleys on Tuesday and
Mid-Atlantic on Wednesday.
To the north, an upper-level shortwave and accompanying surface frontal
system will move along the northern tier of the central U.S. towards the
Upper Midwest. Deep moisture flowing northward ahead of the system will
bring increasing storm chances through tonight. Hot temperatures along
with the plentiful moisture will lead to strong to extreme instability,
prompting an Enhanced Risk of severe weather (level 3/5) from the Storm
Prediction Center. Tornadoes and large hail are possible with the storms,
but the primary threat is a corridor of very high wind across southern
Wisconsin and surrounding states. Additionally, a Marginal to Slight Risk
of excessive rainfall causing flash flooding is in place for portions of
the Upper Midwest with locally heavy downpours. The low system will
continue eastward on Tuesday, with a cold front pushing southeastward into
the Midwest/Great Lakes region. Storms developing along and ahead of the
front could tend to repeat over the same areas as storm motions become
more parallel to the increasingly east-to-westward oriented front. This is
prompting a larger Slight Risk of flash flooding for portions of the
Middle Mississippi Valley with a Slight Risk of severe weather aligned in
a similar area for Tuesday into Tuesday night. By Wednesday, the
southeastward progression of the front will produce thunderstorm chances
from the Lower/Middle Mississippi Valley into the Tennessee and Ohio
Valley to the Mid-Atlantic and Northeast.