US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
341 PM EDT Fri May 21 2021
 
Valid Monday May 24 2021 - Friday May 28 2021
 
Hazards:
- Heavy rain across portions of the Central/Southern Plains, and the Middle Mississippi Valley, 
Tue-Fri, May 25-May 28.
- Flooding possible across portions of the Lower Mississippi Valley and the Southern Plains.
- Flooding occurring or imminent across portions of the Central Plains, the Middle Mississippi 
Valley, the Lower Mississippi Valley, and the Southern Plains.
- Flooding likely across portions of the Central Plains, the Middle Mississippi Valley, the Lower 
Mississippi Valley, and the Southern Plains.
- Much above normal temperatures across portions of the Southeast, the Southern Appalachians, and 
the Tennessee Valley, Mon-Wed, May 24-May 26.
- Much above normal temperatures across portions of the Great Lakes, Tue, May 25.
- Much above normal temperatures across portions of the Mid-Atlantic and the Northeast, Wed, May 26.
 
Detailed Summary:

Heavy rain and anomalous warmth will be the main hazards across the CONUS during the medium range 
period (Monday, May 24th - Friday, May 28th). Upper level troughing in the West will produce 
showers in the Pacific Northwest and Northern Rockies/Plains on Monday as a surface low pressure 
system churns across southern Canada. This system will produce rain and thunderstorms in the 
Southern/Central Plains, Upper Mississippi Valley, Ohio Valley and Mid-Atlantic. The upper-level 
low behind this system will pull a fetch of Gulf moisture leading to the enhancement of rain and 
thunderstorms across the Plains and Upper/Middle Mississippi Valley through Friday where a few 
inches of rain are likely. There seems to be decent agreement on the general area of heavy rain, 
particularly over the Central Plains into the Middle Mississippi Valley through mid-week. 
Temperatures will rise to much above normal levels for the Detroit-Cleveland areas as the warm 
front lifts through the area on Tuesday. High temperatures will be between 15 and 20 degrees above 
average that day.

It is during this same period that the Southeast will be beneath a dome of high pressure. This area 
of high pressure paired with southerly flow will lead to the likelihood of anomalously warm weather 
for parts of the DC-New England I-95 corridor as well a large portion of the Southeast mid-late 
week. Parts of the Southeast may experience record breaking high temperatures during this period.

Alaska will remain quiet in the medium range, with an area of low pressure keeping most of the 
heavy precipitation off the southern coast.

Kebede