…Another round of thunderstorms will bring the potential for flash
flooding from the northern Mid-Atlantic coast into the Northeast this
evening and overnight…
…Severe thunderstorms possible across the central to northern High
Plains through Wednesday while flash flood potential remains over the
Southwest…
…Record breaking heat expected in Texas while locations across the
Midwest, Northeast and Northwest see below average temperatures…
A cold front over the eastern U.S. will continue a slow but steady
movement toward the east through Tuesday morning. Locations near and ahead
of the front will maintain an increased risk of flash flooding from
thunderstorms that repeat over the same location, due to anomalous
moisture in place and favorable winds aloft. Drier and cooler air will
filter in behind the cold front for Tuesday with high temperatures only in
the 60s and 70s for many from the Midwest to northern Mid-Atlantic and
Northeast. High temperature departures of 10 to 20 degrees below mid-late
August averages are anticipated for New York and northern New England on
Tuesday and Wednesday with cloud cover and rain showers keeping
temperatures on the cool side.
High pressure will dominate through mid-week from the Mississippi River to
the Appalachians with a nearly stationary front situated to its south,
extending northward…west of the surface ridge…into the High Plains.
The central to northern High Plains will see threats for severe
thunderstorms and localized flash flooding through tonight as moisture
flows around the west side of the ridge into the Plains and meets with
favorable dynamics aloft. Similar severe weather threats will set up over
the central to northern High Plains on Tuesday and Wednesday.
Flash flooding will remain possible for the Southwest with monsoonal
moisture continuing to support localized slow moving but high rainfall
producing thunderstorms through Wednesday. However, the flash flood threat
areas look to be fairly contained to Arizona, Utah and Colorado beginning
on Tuesday.
Meanwhile to the south, a stubborn, slow moving ridge aloft over the
southern High Plains will allow for hot and humid conditions to persist
for at least the next few days from southern Oklahoma into much of Texas,
south of a stationary front. Some daily record high temperatures could be
met along with heat index values of 105 to near 115 degrees on Tuesday and
Wednesday from the Red River Valley to the Texas Gulf Coast, with the
higher values more likely across the Texas Coastal Plain. Some of the heat
is expected to spread into eastern New Mexico by the middle/end of the
week.
Otto
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
