…Severe thunderstorms possible across the central to northern High
Plains through Wednesday with flash flood potential continuing over the
Southwest…
…Record breaking heat continues across Texas…
A cold front is expected to slow its eastward progression offshore the
East Coast while the southern tail becomes nearly stationary across
Florida, Gulf of Mexico and into the Southern High Plains/Rockies. In its
wake high pressure will anchor over much of the Great Lakes region through
the East, bringing much drier conditions and generally below normal
temperatures for the next couple of days. Over the next few days daily
high temperatures are forecast to be 10 to nearly 20 degrees cooler for
mid-August for Great Lakes and Northeast. Afternoon highs are expected to
top out in the 60s and 70s for many areas from the Midwest to northern
Mid-Atlantic and Northeast. This high pressure is expected to dominate a
majority of the region from the Mississippi River to the Appalachians for
at least a few days. Underneath a strong upper level ridge, record
breaking heat will continue for at least a couple more days across
portions of Texas and southern Oklahoma. Excessive Heat Warnings and Heat
Advisories remain in effect and many daily record high temperatures will
be possible as temperatures soar into the 90s and triple digits. Combined
with the oppressive humidity, daily maximum heat indices up to 110F will
be possible. This will create a dangerous situation for some groups,
particularly anyone spending large amounts of time outdoors. They will be
at a heightened risk of heat-related illness. Some of the heat is expected
to spread into eastern New Mexico by the middle/end of the week.
The western periphery of the high pressure axis where the stalled front
boundary will be setup up, along with interactions with another passing
weather system passing through the Northern Rockies, will have threats for
severe thunderstorms across the Central and Northern High Plains through
Wednesday. The Storm Prediction Center is advertising a Slight Risk (Level
2 of 5) for severe weather including damaging winds and large hail. Deep
monsoonal moisture will persist over the Southwest U.S. bringing a daily
threat of localized and isolated flash flooding. Slow moving but intense
rainfall producing thunderstorms are possible across portions of Arizona,
Utah, Colorado, and New Mexico. For today, the threat appears to be fairly
localized, a greater threat will exist for Wednesday across northern
Arizona where a Slight Risk (Level 2 of 4) of excessive rainfall and flash
flooding exists.
Campbell
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
