US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
258 PM EST Fri Jan 22 2021
 
Valid Monday January 25 2021 - Friday January 29 2021
 
Hazards:
- Heavy precipitation across portions of the Central Appalachians, the Middle Mississippi Valley, 
the Mid-Atlantic, the Southern Appalachians, the Upper Mississippi Valley, the Great Lakes, and the 
Ohio Valley, Mon, Jan 25.
- Heavy rain across portions of California, Tue-Wed, Jan 26-Jan 27.
- Heavy rain across portions of California, Wed, Jan 27.
- Heavy rain across portions of the Central Appalachians, the Tennessee Valley, the Mid-Atlantic, 
the Southern Appalachians, the Southeast, and the Ohio Valley, Mon, Jan 25.
- Heavy snow across portions of California, the Central Great Basin, and the Pacific Northwest, 
Tue-Thu, Jan 26-Jan 28.
- Heavy snow across portions of the Central Great Basin, California, and the Southwest, Mon, Jan 25 
and Wed-Thu, Jan 27-Jan 28.
- Heavy snow across portions of the Central Great Basin and the Southwest, Mon, Jan 25.
- Heavy snow across portions of the Southwest, Mon-Tue, Jan 25-Jan 26.
- High winds across portions of the Aleutians, Tue-Wed, Jan 26-Jan 27.
 
Detailed Summary:

Much of the CONUS will experience an active weather pattern during the medium range period (Monday, 
January 25 to Friday, January 29). A shortwave will generate heavy precipitation over parts of the 
Mid-west on Monday. The associated surface low will track across the Tennessee/Ohio Valleys and 
spread heavy rain across that area on Monday. Heavy precipitation may also develop over the Central 
Appalachians and into eastern Pennsylvania that day. Another shortwave spinning through the 
Southwest/Great Basin will produce heavy snow over the southern Sierra, eastern Nevada, southeast 
Utah on Monday, and central Arizona on Monday and Tuesday. Effects from a deep upper-level low will 
impact northern/central California between Tuesday and Wednesday of next week. This system is 
forecast to produce heavy rain along the northern/central California coast while dumping heavy snow 
from southeastern Oregon into the Sierra during this period. Parts of coastal California may 
receive multiple inches of rain over the two day period, which may cause serious flooding due to 
the ongoing drought and burn scar areas present. The Sierra may accumulate multiple feet of snow 
from this system. Temperatures will be above normal as a warm front lifts through the Lower/Middle 
Mississippi Valley and Tennessee Valley on Monday.

Meanwhile, in Alaska, a deep area of low pressure will generate high winds across the western tip 
of the Aleutians between Tuesday and Wednesday. Winds will generally be higher than normal across 
the Aleutians during this period.

Kebede