US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
258 PM EDT Tue Jul 23 2019
 
Valid Friday July 26 2019 - Tuesday July 30 2019
 
Hazards:
- Heavy rain across portions of the Middle Mississippi Valley, the Lower Mississippi Valley, the 
Great Lakes, and the Ohio Valley, Mon-Tue, Jul 29-Jul 30.
- Heavy rain across portions of the Middle Mississippi Valley, the Great Lakes, and the Upper 
Mississippi Valley, Sun, Jul 28.
- 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 Middle Mississippi Valley.
- Excessive heat across portions of California and the Southwest, Fri-Sun, Jul 26-Jul 28.
 
Detailed Summary:

Friday (July 26) through Tuesday (July 30) is forecast to have only a few weather hazards across 
the United States. Upper-level ridging across the western U.S. at the beginning of the period will 
turn to a more zonal flow by the beginning of next week.  This will lead to above-average 
temperatures across the lower elevations of the DesertSouthwest, with heat indices approaching 115 
degrees Friday through Sunday, and low temperatures only dropping to around 90 degrees.  Otherwise, 
temperatures will be close to seasonal average across the majority of the nation.

Heavy rain will be possible across the Upper Mississippi Valley starting Saturday night and into 
Sunday. Several impulses of energy will ride overtop of the ridging set in place and along a slow 
moving cold front.  Confidence is low regarding the exact placement of the heaviest rain, but still 
a high enough signal to place a highlighted area.  Towards the end of the forecast period on Monday 
and Tuesday, the best model signal for a broken axis of heavy rainfall would be from southern 
Missouri to western Ohio.

A few other regions that could see heavy rain, but not enough confidence to warrant a heavy rain 
area, include Florida and the southern Rockies/Southwest. The cold front currently moving through 
the eastern U.S. is forecast to stall and later die across the Gulf Coast and northern Florida. 
This could result in locally heavy rain across northern Florida. Monsoonal moisture could also lead 
to heavy rain across the Southern Rockies and Southwest, but amounts don't seem high enough (>1 
inch in 24 hours) to reach hazardous criteria.

Hamrick