US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
354 PM EDT Fri Jun 04 2021
 
Valid Monday June 07 2021 - Friday June 11 2021
 
Hazards:
- Heavy rain across portions of the Middle/Lower Mississippi Valley, the Southern Plains, and the 
Tennessee Valley, Mon-Wed, Jun 7-Jun 9.
- Flooding possible across portions of the Lower Mississippi Valley and the Southern Plains.
- Flooding occurring or imminent across portions of the Southern Plains and the Northern Rockies.
- Flooding likely across portions of the Northern Great Basin.
- Much above normal temperatures across portions of the Central Plains, the Great Basin, the 
Northern Plains, the Northern/Central Rockies, and the Upper Mississippi Valley, Mon-Fri, Jun 7-Jun 
11.
- Much above normal temperatures across portions of the Great Lakes and the Upper Mississippi 
Valley, Mon-Tue, Jun 7-Jun 8.
- Much above normal temperatures across portions of the Great Lakes, the Mid-Atlantic, the 
Northeast, and the Central Appalachians, Mon-Wed, Jun 7-Jun 9.
 
Detailed Summary:

A weak upper-level low over Texas and a weak front extend across the Central/Western Gulf Coast 
through Wednesday in the medium-range forecast period. The circulation around the upper-level low 
will pull moisture northward off the Gulf of Mexico.  The energy will produce showers and 
thunderstorms over parts of northeastern Texas and the Lower Mississippi Valley.  The rain will be 
heavy enough to depict an area of heavy rain on the Hazards Chart from Monday into Tuesday.  The 
heavy rain will have the greatest areal coverage on Monday  over northeastern Texas and parts of 
Arkansas, with a much smaller area over Tennessee Valley Wednesday.  Moisture will continue to 
stream northward over the Plains/Mississippi Valley and the Ohio/Tennessee Valleys.  With the lack 
of a definable boundary over the area, it will be hard to pinpoint where the heavy rain will be on 
Thursday and Friday.  The models are also very uncertain where the heavy rain will be, too.

An upper-level ridge will extend over parts of the western part of the country to the Northeast. 
The upper-level ridging will last the longest over the parts of the Rockies and Plains into parts 
of the Upper Mississippi Valley through Friday.  The upper-level ridging will aid in producing 
above normal temperatures over the region.  Over the Upper Great Lakes, the much above normal 
temperatures will last from Monday into Tuesday when the upper-level low from Texas moves over the 
area. Over the Northeast, the much above normal temperatures will last from Monday into Wednesday.  
On Wednesday, weak upper-level troughing will move over the Northeast.   The Central/Northern 
Rockies area into the Northern Plains will have much above normal temperatures, the longest from 
Monday into Friday. 

Meanwhile, a tight pressure gradient offshore from Northern/Central California will produce strong 
wind offshore from Monday into Tuesday.  The wind speed will not meet the criteria for an area of 
high wind.  However, boaters are encouraged to check with the local forecast office for any marine 
advisories.

For Alaska, an area of low pressure will develop over the Gulf of Alaska on Tuesday into Wednesday. 
 The models are uncertain about the location and timing of heavy rain over parts of the Kenai 
Peninsula and adjacent regions.  Therefore, an area of heavy rain was not placed over the region on 
Tuesday and Wednesday. It will be likely that some heavy rain will develop over the region, but the 
location and timing are uncertain at this point in time. 

Ziegenfelder