Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
119 AM EDT Sun Jul 23 2023

Valid 12Z Sun Jul 23 2023 - 12Z Tue Jul 25 2023

...Excessive Heat Warnings and Advisories from parts of California, the
Northern Intermountain Region, Southwest, and the Great Basin; a second
area in Florida and the Western Gulf Coast...

...There are Air Quality Alerts over parts of the Upper Mississippi
Valley...

The severe weather and excessive rainfall threats will diminish over the
coming days as the upper-level pattern weakens a bit. In the meantime, the
Gulf Coast will experience showers and thunderstorms thanks to a
quasi-stationary front that is draped across the region. This front will
provide some focus for the convective activity and potentially isolated
instances of flash flooding that occurs. Troughing across the East Coast
will support scattered thunderstorms across the Mid-Atlantic and Southeast
this afternoon and evening. There's a chance that some of these storms may
turn severe. This same trough will shuttle Canadian wildfire smoke down
into parts of the Upper Mississippi Valley today, where Air Quality Alerts
are currently in effect. A cold front descending into the Great Lakes will
potentially generate additional scattered thunderstorms across the Midwest
through Monday. Monsoonal moisture is expected to continue impacting
portions of the Southwest and Four Corners region with scattered showers
and thunderstorms for the next few days.

The dangerous, long-lived and record-breaking heat wave will continue over
the Southwest through the rest of this weekend, particularly in the low
desert areas, with triple digit high temperatures also extending northward
into the Central Great Basin. Temperatures next week are forecast to
remain hot, but return closer to average. Relief arrives today for the
Mid-South, Southeast and Gulf Coast but excessive heat and humidity will
rebuild across these areas by late this week. Take the heat seriously and
avoid extended time outdoors. Temperatures and heat indices will reach
levels that would pose a health risk to anyone without effective cooling
and/or adequate hydration. Nighttime temperatures will provide very little
relief. Heat is the leading weather-related killer in the U.S.. The Great
Plains will experience a warm up over the next few days as an upper ridge
builds over the region.


Kebede


Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php