Weather Saturday June 22 2024 The heat continues near 100 DC Baltimore Philly and NYC Shower and t-storms great lakes into New England

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Record hot temperatures over portions of the Midwest/Ohio Valley & the
Mid-Atlantic states this weekend...
...Heavy rain and flash flooding concerns across the Upper Midwest Friday
night and Great Lakes Saturday...
...Monsoon-like conditions for this Southwest this weekend into
Monday...Heat building across the West...
A heat wave should continue for portions of the Midwest/Ohio Valley and
the Mid-Atlantic States, to the south of a stationary front. Forecast high
temperatures will rise into the upper 90s/near 100 Saturday in the
Mid-Atlantic, with record-tying/breaking temperatures possible.
Heat-related Advisories and Warnings are in place as these temperatures,
when combined with the humidity, will bring heat index values into the
100-105 degree range, with values as high as 110 possible through the
southern Mid-Atlantic on Saturday. Additionally, overnight low
temperatures will remain in the mid-70s for many locations, at potential
record-tying/breaking levels, providing little relief from the heat. The
early arrival of this heat in the Summer season, persistence over multiple
days, and abundant sunshine will aggravate heat stress on those without
reliable air conditioning. Temperatures more broadly from the East Coast
to the central/southern Plains will be in the mid-90s this weekend.
Meanwhile, relief continues to the north of a frontal boundary draped
though southern New England, with highs now mostly in the 70s and low 80s.
Isolated to scattered excessive rainfall/flash flooding is possible near
the stalled frontal boundary.
The greatest threat for significant heavy rainfall will be ahead of a
surface wave over portions of the Upper Midwest as thunderstorm complexes
late on Friday unleash their potential. A Moderate Risk of Excessive
rainfall (level 3/4) is in effect, from southeast South Dakota to in and
near the Minnesota/Iowa border, where the highest potential for heavy
rainfall/significant flash flooding exists. Moderate to major river
flooding is also forecast to worsen. Additional scattered instances of
flash flooding will be possible more broadly across the Upper Midwest. An
upper-level shortwave approaching from the west will help to deepen the
frontal wave and push the system eastward on Saturday, bringing the threat
for heavy rainfall/flash flooding to portions of the Great Lakes
southwestward into the Upper Mississippi Valley as an organized complex of
storms is expected to follow the system eastward. Some severe
thunderstorms will again be possible with a Slight Risk in place mainly
for the threat of damaging winds. As the system pushes into New England
on Sunday, it brings an elevated risk of flash flooding to the region.