US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
433 PM EDT Thu Jul 23 2020
 
Valid Sunday July 26 2020 - Thursday July 30 2020
 
Hazards:
- Heavy rain across portions of the Central Great Basin, the Central/Southern Rockies, and the 
Central/Southern Plains, Sun-Tue, Jul 26-Jul 28.
- Heavy rain across portions of the Central/Southern Plains, the Middle/Lower Mississippi Valley, 
and the Southeast, Sun-Mon, Jul 26-Jul 27.
- Heavy rain across portions of the Southeast and the Mid-Atlantic, Wed-Thu, Jul 29-Jul 30.
- Heavy rain across portions of the Great Lakes and the Ohio Valley, Mon, Jul 27.
- Heavy rain across portions of the Northeast, Tue, Jul 28.
- Flooding possible across portions of the Southern Plains.
- Flooding occurring or imminent across portions of the Central Plains and the Northern Plains.
- Excessive heat across portions of the Northern/Central Plains and the Upper/Middle Mississippi 
Valley, Sun, Jul 26.
- Excessive heat across portions of the Southeast and the Mid-Atlantic, Mon-Tue, Jul 27-Jul 28.
- Much above normal temperatures across portions of the Pacific Northwest, the Northern Rockies, 
and the Northern Great Basin, Sun-Tue, Jul 26-Jul 28.
- Much above normal temperatures across portions of the Mid-Atlantic and the Northeast, Sun-Mon, 
Jul 26-Jul 27.
- Heavy rain across portions of the Alaska Panhandle and mainland Alaska, Sun, Jul 26.
- Heavy rain across portions of mainland Alaska, Mon, Jul 27.
 
Detailed Summary:

Early next week for the beginning of the medium range period (Sunday, July 26), what is currently 
Tropical Depression Eight per the National Hurricane Center should produce heavy rain over southern 
portions of Texas as it moves westward after making landfall in Texas on Saturday. In conjunction 
with this tropical system, anomalously high tropical moisture should continue to affect the Gulf 
Coast states, and the central Gulf Coast could also see heavy rain early next week. 

To the north, rainfall is possible along and ahead of a front forecast to move across the Plains 
and Midwest toward the Eastern Seaboard by midweek. Heavy rainfall is expected to focus across the 
Middle Mississippi Valley, Central Plains, and back toward the Central/Southern Rockies as the 
front stalls. Additional monsoonal moisture and possibly tropical moisture should contribute to 
this rainfall. As the front moves more quickly farther east, a couple of areas of quick-hitting 
heavy rain are currently forecast along it, one over the Upper Ohio Valley Monday and one in 
northern New England Tuesday. Another area of potentially heavy rainfall is the eastern Carolinas 
by Wednesday and Thursday of next week. 

In terms of the upper levels, an expansive upper-level high will dominate much of the contiguous 
U.S. early next week. The core of the upper high is expected to move westward through the period 
toward the Four Corners region, as another high moves into the Pacific Northwest, combining to 
create a good ridge over the Northwest. Meanwhile, upper-level troughing is forecast to press 
eastward from the Midwest Monday into the Great Lakes and Northeast/Mid-Atlantic midweek. The 
Pacific Northwest to Northern Great Basin can expect high temperatures 10 to 15 degrees above 
normal for early parts of next week underneath the ridge, and temperatures several degrees above 
average should push toward the Northern Plains later in the week. Farther east, excessive heat is 
possible centered over Iowa on Sunday before the aforementioned cold front passes, with heat 
indices over 105 degrees possible. Then along the Eastern Seaboard, high temperatures in the 90s 
should stretch toward New England on Sunday/Monday ahead of the front. Farther south, hot 
temperatures and high dewpoints could create another round of excessive heat across portions of the 
Mid-Atlantic and Carolinas on Monday and especially Tuesday.

Over Alaska, moisture inflow near a surface low pressure system in the Gulf of Alaska could lead to 
heavy rainfall across the southeastern mainland into the Panhandle on Sunday. Then, chances of 
precipitation increase in interior Alaska as moisture increases around Monday. Model guidance 
varies with the placement and magnitude of the rainfall, but delineated a Heavy Rainfall hazard 
area to show the threat exists. Temperatures are expected to remain cool across much of the state, 
especially for daytime highs. 

Hurricane Douglas is still expected to move near or over portions of Hawaii early next week, per 
the National Hurricane Center. There is an increasing chance that strong winds, dangerous surf, and 
heavy rainfall could affect portions of the state beginning on Sunday. 

Tate