US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
426 PM EDT Fri Aug 28 2020
 
Valid Monday August 31 2020 - Friday September 04 2020
 
Hazards:
- Heavy rain across portions of the Central Plains, the Lower Mississippi Valley, the Central 
Appalachians, the Tennessee Valley, the Middle Mississippi Valley, the Mid-Atlantic, the Southern 
Plains, and the Ohio Valley, Mon-Tue, Aug 31-Sep 1.
- Heavy rain across portions of the Great Lakes, the Northeast, and the Southern Plains, Wed-Thu, 
Sep 2-Sep 3.
- Flooding possible across portions of the Southern Appalachians, the Mid-Atlantic, and the Central 
Appalachians.
- Flooding occurring or imminent across portions of the Lower Mississippi Valley.
- Excessive heat across portions of the Southern Plains, Mon-Fri, Aug 31-Sep 4.
- Much below normal temperatures across portions of the Central Rockies, the Central Great Basin, 
the Northern Rockies, the Northern Great Basin, and the Northern Plains, Mon, Aug 31.
- Heavy rain across portions of the Alaska Panhandle and mainland Alaska, Mon, Aug 31.
- Heavy rain across portions of the Alaska Panhandle, Mon-Tue, Aug 31-Sep 1.
 
Detailed Summary:

Canadian air will bring a brief cool down to parts of the Northern Rockies as an upper-level trough 
tracks across the Rockies this weekend. Temperatures will rebound to near normal by beginning of 
the week; while South Texas will continue to have heat and humidity- heat indices could exceed 110 
degrees through the medium-range period. Portions of Louisiana impacted by tropical cyclone Laura 
will continue to have flooding. A frontal boundary lifting into the central U.S. will provide a 
focus for heavy rain Monday and Tuesday from northern Texas to Middle Mississippi Valley/Midwest. 
Further north, a cold front will sweep across the northern tier states into the Great 
Lakes/Northeast region. Heavy rain will develop near the lower lakes and New York Wednesday and 
Thursday.  

A deep plume of tropical moisture from the remains of the tropical cyclone Bavi will be drawn into 
a strong low pressure system tracking across the Gulf of Alaska. Heavy rain will spread along and 
north of the low track, impacting the southern Mainland on Monday and the panhandle Monday and 
Tuesday. A few light showers may linger into Wednesday across the Southeast.

Campbell