US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
359 PM EST Tue Jan 19 2021
 
Valid Friday January 22 2021 - Tuesday January 26 2021
 
Hazards:
- Heavy precipitation across portions of the Mid-Atlantic, and the Central Appalachians, Mon, Jan 
25.
- Heavy rain across portions of the Lower/Middle Mississippi Valley, the Central/Southern 
Appalachians, the Tennessee/Ohio Valley, the Mid-Atlantic, the Southeast, and the Southern Plains, 
Sun-Mon, Jan 24-Jan 25.
- Heavy snow across portions of California, the Pacific Northwest, and the Northern Great Basin, 
Sun, Jan 24.
- Heavy snow across portions of California, Mon, Jan 25.
- Heavy snow across portions of the Central Rockies, the Central Great Basin, and the Northern 
Great Basin, Fri-Sat, Jan 22-Jan 23rd and Mon, Jan 25.
- Heavy snow across portions of the Central Great Basin and the Southwest, Sat-Mon, Jan 23-Jan 25.
- Heavy snow across portions of the Southern Rockies, the Central Rockies, the Central Great Basin, 
and the Southwest, Fri-Mon, Jan 22-Jan 25.
- Heavy snow across portions of the Great Lakes, the Upper Mississippi Valley, and the Northern 
Plains, Sat-Sun, Jan 23-Jan 24.
- Flooding occurring or imminent across portions of the Southeast.
 
Detailed Summary:

A shortwave will bring heavy snow to the West, and eventually heavy rain and snow to the East 
during the Medium Range period (Friday, Jan. 22 - Tuesday, Jan. 26). A surface low pressure system 
will enter the West through northern California on Friday. This system will produce heavy snow over 
parts of the Central/Southern Rockies from Friday through Monday, but will let up over parts of the 
Utah Rockies on Sunday. Another heavy snow threat will emerge over the Upper Midwest/Great Lakes on 
Saturday and will continue into Sunday as the Rockies low pressure spills out over the 
Central/Southern Plains. This system will drop into the Southern Plains and track across the Deep 
South this weekend. There's a chance for heavy rain over a swath extending from the ArkLaTex region 
to the Mid-Atlantic between Sunday and Monday of next week. Enough cold air may seep into the 
Central Appalachians and Mid-Atlantic to produce some heavy precipitation on Monday, but the 
chances of this are relatively low at the moment. Back in the West, another shortwave will swing 
into the coast on Sunday. This system will carry the potential for heavy snow to the Cascades and 
Olympics. As the upper-level feature slips southward on Monday, it will generate an area of heavy 
snow over the Sierra and Central/Southern Rockies. Temperatures will remain seasonal across the 
CONUS during the medium range period.

In Alaska, a deep area of surface low pressure will enter the Bering Sea on Sunday. This low 
pressure system may produce strong winds along the Aleutian and western mainland coast through 
Monday.

Kebede