US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
304 PM EDT Thu Jul 18 2019
 
Valid Sunday July 21 2019 - Thursday July 25 2019
 
Hazards:
- Heavy rain across portions of the Central Plains, the Central Rockies, the Central Great Basin, 
the Southern Rockies, the Southern Plains, and the Southwest, Sun-Tue, Jul 21-Jul 23.
- Heavy rain across portions of the Southeast, the Lower Mississippi Valley, and the Southern 
Plains, Tue-Thu, Jul 23-Jul 25.
- Heavy rain across portions of the Lower Mississippi Valley, Tue-Wed, Jul 23-Jul 24.
- Heavy rain across portions of the Central Appalachians, the Tennessee Valley, the Mid-Atlantic, 
the Southern Appalachians, the Southeast, and the Ohio Valley, Sun-Mon, Jul 21-Jul 22.
- Heavy rain across portions of the Southeast, the Southern Appalachians, the Mid-Atlantic, and the 
Central Appalachians, Mon-Tue, Jul 22-Jul 23.
- Heavy rain across portions of the Southeast and the Mid-Atlantic, Wed, Jul 24.
- Flooding occurring or imminent across portions of the Central Plains, the Middle Mississippi 
Valley, the Lower Mississippi Valley, the Upper Mississippi Valley, and the Northern Plains.
- Flooding likely across portions of the Northern Plains.
- Excessive heat across portions of the Southeast, the Southern Appalachians, the Mid-Atlantic, the 
Northeast, and the Central Appalachians, Sun, Jul 21.
- Excessive heat across portions of the Southeast and the Mid-Atlantic, Mon, Jul 22.
 
Detailed Summary:

The ongoing heat wave across the central U.S. late this week is forecast to abate by the beginning 
of this forecast period, while the East Coast will endure the heatwave through Sunday.  Widespread 
high temperatures in the mid 90s to low 100s can be expected on Sunday. In addition, dewpoints 
rising well into the 70s will result in heat indices peaking in the 105 to 115 degree range during 
the afternoon hours.  Another factor worth noting will be the anomalously warm overnight low 
temperatures.  This will especially hold true for the big cities of the Mid-Atlantic and Northeast, 
with lows failing to fall below 80 degrees at night. This is assuming that no significant rainfall 
occurs during those evening and overnight periods.  By Monday, the heat and humidity abates enough 
across the Mid-Atlantic and Northeast to fall below excessive heat criteria, but will likely linger 
for parts of the Southeast U.S. until Tuesday, when a cold front passes through the region and 
brings relief.

The main area of concern for heavy rain will be across the Southeastern quadrant of the U.S. next 
week as the cold front intercepts a moist airmass and helps generate numerous showers and 
thunderstorms.  These should be most prevalent from the central Gulf Coast to the Mid-Atlantic 
region, with the potential for some 1 to 3 inch rainfall totals for the first half of next week.  
Heavy showers are also expected across parts of the central and southern Rockies, mainly during the 
afternoon hours.

No weather hazards are forecast for Alaska during this period.


Hamrick