…Much above average temperatures/record heat to stretch from the Mid
West to the East coast…
…Active showers and thunderstorms expected around the peripheries of the
Mid West to eastern heat with heavy rains, flash flooding and severe
weather possible…
The closed upper high currently centered over the Mid Mississippi
Valley/Ohio Valley region will be expanding eastward over the next two
days, spreading into large portions of the east coast from the
Mid-Atlantic southward. This will support an eastward expansions of much
above average temperatures into the middle part of this week with high
temperatures Tuesday and Wednesday anywhere from 10 to 15 degrees above
average. This will support the potential for record high temperatures in
the middle to upper 90s over the next several days from the Mid West, into
the Ohio Valley, Tennessee Valley, Southern to Central Appalachians and
into the Mid- Atlantic. The combination of hot temperatures and high
humidity levels will produce maximum daily heat indices of between 105 and
115 degrees F across these regions with major to extreme heat risks.
Excessive Heat Warnings and Heat advisories are currently in effect across
the Mid to Upper Mississippi Valley, the Mid West and southern New
England, affecting nearly 61 million people, with further expansion of
these warnings and advisories possible into portions of the Mid-Atlantic
over the next two days.
Around the peripheries of the above mentioned upper high, precipitation is
likely to be active across the Gulf Coast and from portions of the
Southwest, northeastward into the Central Plains, Upper Mississippi
Valley, Upper Great Lakes into Northern New England. In these regions,
moisture values are forecast to remain above average, supporting the
potential for areas of active thunderstorms, heavy rains and flash
flooding. In addition, these thunderstorms will also support potential
for severe weather, especially across eastern portions of the Central to
Northern Plains, Upper Mississippi Valley and Upper Lakes Monday night
into early Tuesday and across portions of the Lower Great Lakes Tuesday
afternoon into Tuesday evening/night.
While much above to record highs dominate portions of the central to
eastern U.S. into mid week, a strong front will be pushing inland into the
Pacific Northwest tonight into Tuesday, through the Northern Rockies and
into the Northern High Plains by Tuesday evening. Much below average
temperatures likely in the wake of this front across the Pacific Northwest
on Tuesday and into the Northern Rockies/Northern High Plains on
Wednesday, with high temperatures 10 to 20 degrees below average. There
is not expected to be a lot of precipitation with this front over the
northwest, but the falling temperatures will support at least some light
snowfall amounts across the Northern Rockies of Montana.
Oravec
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
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