US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
311 PM EDT Tue Sep 10 2019
 
Valid Friday September 13 2019 - Tuesday September 17 2019
 
Hazards:
- Heavy rain across portions of the Southeast and the Lower Mississippi Valley, Sun-Mon, Sep 15-Sep 
16.
- Flooding possible across portions of the Great Lakes, the Upper Mississippi Valley, and the 
Northern Plains.
- Flooding likely across portions of the Northern Plains.
- Much above normal temperatures across portions of the Lower Mississippi Valley, the Central 
Appalachians, the Tennessee Valley, the Great Lakes, the Middle Mississippi Valley, the Southern 
Appalachians, the Southeast, the Southern Plains, and the Ohio Valley, Fri, Sep 13.
- Heavy rain across portions of the Alaska Panhandle and mainland Alaska, Fri, Sep 13.
 
Detailed Summary:

The medium range period (Friday-Tuesday) will mostly feature upper-level troughs in the western 
U.S. and upper-level ridging across the Southeast. The biggest threat for heavy rain will be across 
the Gulf Coast as a surface trough enters from the Bahamas on Friday. The majority of the shower 
and thunderstorm activity associated with the system is currently forecast to remain over the Gulf 
of Mexico and portions of Florida through Saturday. By Sunday, tropical moisture is expected to 
drift north into the immediate coastal regions of the central Gulf Coast and could result in heavy 
rain. For more information, visit the National Hurricane Center (www.nhc.noaa.gov).    

Upper-level ridging over the southeastern U.S. will result in much above normal temperatures from 
the Ohio Valley to the Deep South on Friday. The highest maximum temperature anomalies are expected 
to be around 10 to 15 degrees above normal from central Tennessee to southern Ohio. High 
temperatures are forecast to reach the mid-to-upper 90s across the Deep South and Tennessee Valley, 
with low 90s across the Ohio Valley. Even though it will be hot, heat indices are forecast to 
remain below 105F due to relatively dry air and lower humidity. Above normal temperatures will also 
begin to build across the Great Lakes and Midwest by Monday, but high temperatures in the 80s 
aren't considered hazardous across this region in September.

In Alaska, a weakening low pressure system is forecast to impact the southern coast on Friday. 
Rainfall amounts could add up to over 2 inches, hence the heavy rain area on the hazards graphic. 
The rest of the medium range period (through Tuesday) will remain relatively active across Alaska, 
but rain and snow amounts appear too low for additional highlights.  

Snell