US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
502 PM EDT Wed Aug 26 2020
 
Valid Saturday August 29 2020 - Wednesday September 02 2020
 
Hazards:
- Heavy rain across portions of the Central/Southern Plains, the Mississippi Valley, the Great 
Lakes, and the Ohio Valley, Sun-Tue, Aug 30-Sep 1.
- Heavy rain across portions of the Northeast, the Central/Southern Appalachians, the Mid-Atlantic, 
the Great Lakes, and the Ohio Valley, Sat, Aug 29.
- Severe weather across portions of the Great Lakes, the Mid-Atlantic, the Northeast, the Central 
Appalachians, and the Ohio Valley, Sat, Aug 29.
- Flooding possible across portions of the Lower Mississippi Valley and the Southern Plains.
- Flooding likely across portions of the Lower Mississippi Valley and the Southern Plains.
- Excessive heat across portions of the Southern Plains, Sat-Wed, Aug 29-Sep 2.
- Much below normal temperatures across portions of the Northern/Central Great Basin, the Northern 
Plains, and the Northern/Central Rockies, Sun-Mon, Aug 30-Aug 31.
- Heavy rain across portions of mainland Alaska, Sat-Sun, Aug 29-Aug 30.
- High winds across portions of mainland Alaska and the Aleutians, Sun-Mon, Aug 30-Aug 31.
 
Detailed Summary:

The medium range (Saturday, August 29 - Wednesday, September 2) will feature active weather across 
the central and eastern parts of the country, while a cool down will occur in the Northwest. 
Hurricane Laura is currently a major category 4 hurricane in the Gulf of Mexico and is forecast to 
make landfall along the southwest Louisiana coast tonight before eventually curving to the 
northeast on Friday. Flooding will persist in Laura's wake through Monday along the Lower/Middle 
Mississippi Valley. Heavy Rain associated with Laura is likely to fall over the Ozarks on Sunday 
before spreading north and east across the Middle/Upper Mississippi Valley through Tuesday. If 
Laura is able to maintain a well-defined circulation while traversing the interior Deep South 
toward the Mid-Atlantic, a period of gusty winds and heavy rainfall could impact parts of the 
Mid-Atlantic on Saturday. Meanwhile, a low pressure system developing along a stationary front 
across the northern tier states will track quickly across the Midwest on Friday and then across the 
Northeast and Mid-Atlantic on Saturday. This will likely bring a period of enhanced rainfall and 
the potential for severe thunderstorms across these areas as what remains of Laura will likely be 
pushed off the East Coast later on Saturday. For more information about Hurricane Laura visit the 
National Hurricane Center's website: www.nhc.noaa.gov.

In the Northwest, an upper level trough will amplify as it traverses the Rockies this weekend. A 
cool Canadian airmass will filter into the region behind the upper level feature and its associated 
surface low pressure system. Much below normal temperatures are expected for large portions of 
Idaho, Montana and Wyoming as well as parts of the western Dakotas on Sunday and Monday as a result.

By contrast, excessive heat and humidity will appear to persist across southern Texas where 
afternoon heat indices could exceed 110 degrees through the medium-range period.

For Alaska, a potent low pressure system will track from the Aleutian islands toward western 
Alaska. This system will produce gale to possibly storm-force winds across the eastern Aleutians 
and southwestern mainland Alaska on Sunday and Monday. Heavy rainfall is likely to occur along the 
southern mainland coast around Anchorage on Saturday and Sunday. Heavy rainfall is also possible 
for the Alaskan Panhandle early next week, but amounts are not enough to warrant a hazard area at 
this time.

Kebede/Kong