US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
252 PM EDT Fri Sep 06 2019
 
Valid Monday September 09 2019 - Friday September 13 2019
 
Hazards:
- Heavy rain across portions of the Great Lakes, the Upper Mississippi Valley, and the Northern 
Plains, Mon-Tue, Sep 9-Sep 10and Thu-Fri, Sep 12-Sep 13.
- Flooding occurring or imminent across portions of the Southeast and the Northern Plains.
- Much above normal temperatures across portions of the Lower Mississippi Valley, the Tennessee 
Valley, the Middle Mississippi Valley, the Southern Appalachians, the Southeast, the Southern 
Plains, and the Ohio Valley, Mon-Tue, Sep 9-Sep 10.
- Heavy rain across portions of the Alaska Panhandle and mainland Alaska, Thu-Fri, Sep 12-Sep 13.
 
Detailed Summary:

The medium range period (Monday-Friday) will mostly feature upper-level troughs in the western U.S. 
and upper-level ridging in the Southeast. The first system forecast to bring the threat of heavy 
rain will enter the Northern Plains by Monday and could bring 1 to 2 inches of rain from North 
Dakota to the Upper Great Lakes. This same area could see a second round of heavy rain as another 
system follows on Thursday. Total rainfall amounts around 2 to 4 inches are possible in the 
north-central U.S. between Monday and Friday, with locally higher amounts. The first system 
mentioned above is forecast to enter the Northeast on Wednesday and Thursday, but rainfall amounts 
appear too low to include a highlighted hazard area.

Upper-level ridging over the southeastern U.S. will result in above normal temperatures across much 
of the Southeast and Tennessee Valley on Monday and Tuesday. The highest maximum temperature 
anomalies are expected to be around 10 to 15 degrees above normal. High temperatures across these 
areas will reach the upper 90s, with a few areas possibly reaching 100 degrees on Monday. Even 
though it will be hot, heat indices are forecast to remain below 105F due to relatively dry air and 
lower humidity. Meanwhile, due to the active weather pattern, portions of the Northwest, Northern 
Rockies, and Northern Plains could see high temperatures 10 to 20 degrees below normal. 

In Alaska, a pair of low pressure systems are forecast to enter the southeastern portions of the 
state by Wednesday. This will bring gusty winds and scattered showers to the Aleutian Islands, with 
heavier rain likely across southern mainland Alaska by Thursday and Friday. Rainfall totals could 
exceed 2 inches in 24 hours, prompting a heavy rain area on the hazards graphic.

Snell