…NHC monitoring a tropical disturbance in the southwestern Gulf…
…Severe thunderstorms with heavy rain possible over the northern Plains
and Upper Midwest through the weekend…
…Hazardous heat from the Central Plains to Midwest this weekend…
The National Hurricane Center (NHC) is monitoring a tropical disturbance
in the southwestern Gulf, which may bring moderate to locally heavy rain
to portions of South Texas today into Saturday. This disturbance should
move inland over northeastern Mexico or South Texas this afternoon or
evening. For more information, see the latest Tropical Weather Outlook
from NHC.
To the north, a slow-moving front will continue to sink south into the
northern Plains and Upper Midwest, triggering scattered showers and
thunderstorms through the weekend. An upper level shortwave is forecast to
move over the Upper Midwest this afternoon and evening, which will provide
support for scattered severe thunderstorms. Severe storms may produce
damaging winds, hail, a brief tornado, and/or heavy rain and flash
flooding. Storms will likely continue through the overnight hours tonight,
and additional rounds of storms, some severe, are forecast to impact the
Upper Midwest again on Saturday and Sunday and may lead to scattered
instances of flash flooding. Showers and storms are expected to spread
into the Northeast on Sunday the front approaches the region.
Elsewhere, daily chances for showers and thunderstorms will exist across
the South and Southeast as a weak frontal boundary stalls across the
region, and precipitation chances will increase across the Pacific
Northwest as a cold front moves onshore this weekend, progressing into the
northern Rockies, Great Basin, and northern California by Sunday. Monsoon
moisture in the Southwest will also support persistent precipitation
chances across the Four Corners region through the weekend. In the South
and West, locally heavy rain may have the potential to cause isolated
instances of flash flooding.
Temperature-wise, the West Coast should remain cooler than average while
much of the Central and Eastern U.S. experience above average
temperatures. The highest temperature anomalies are forecast to spread
from the Central Plains to the Midwest this weekend, with high
temperatures in the mid-to-upper 90s and low 100s and heat index values in
the low-to-mid 100s. This level of heat is expected to create Major to
locally Extreme HeatRisk in these regions, which could be hazardous to
anyone without adequate cooling and/or hydration.
Dolan
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
