US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
241 PM EST Fri Feb 26 2021
 
Valid Monday March 01 2021 - Friday March 05 2021
 
Hazards:
- Heavy rain across portions of the Pacific Northwest, Wed-Thu, Mar 3-Mar 4.
- Heavy rain across portions of the Southeast, the Lower Mississippi Valley, the Southern Plains, 
and the Tennessee Valley, Mon, Mar 1.
- Heavy snow across portions of the Pacific Northwest and the Northern Great Basin, Mon-Tue, Mar 
1-Mar 2.
- Flooding possible across portions of the Central/Southern Appalachians, the Lower Mississippi 
Valley, the Ohio Valley, and the Tennessee Valley.
- Flooding occurring or imminent across portions of the Southeast and the Mid-Atlantic.
- Flooding likely across portions of the Southeast.
- High winds across portions of mainland Alaska and the Aleutians, Mon, Mar 1.
 
Detailed Summary:

The medium-range period (Monday, March 1 - Friday, March 5) has a quasi-stationary front extending 
from Southeast to the Western Gulf Coast on Monday.  The boundary will have a wave of low pressure 
develop along the front that will move eastward along the Gulf Coast on Tuesday into Wednesday.  As 
the surface low moves off the Southeast Coast, the boundary will move southward to the Florida 
Straits by Friday.

Moisture from the Gulf of Mexico will pool along the boundary, aiding in producing heavy rain over 
parts of the Southern Plains and Lower Mississippi/ Tennessee Valleys on Monday. The boundary will 
remain quasi-stationary across the Gulf Coast on Tuesday and Wednesday, before moving southward to 
the Florida Straits on Thursday into Friday. A wave of low pressure will move along the front from 
Tuesday into Wednesday.  Light rain will continue along the Gulf Coast into the Southeast from 
Tuesday into Wednesday evening, and then move over the Florida Peninsula on Thursday into Friday. 

On Monday, upper-level energy moving over the Great Lakes that will produce light snow over the 
region and move into parts of the Northeast by Monday evening into early Tuesday.  Later on Monday, 
a front will move into the Pacific Northwest, producing light rain and higher elevation snow.  The 
snow will be heavy enough to meet the heavy snow criteria over parts of the Northern Cascades on 
Monday and Tuesday.  Furthermore, weak onshore flow will help produce rain over the Olympic 
Peninsula on Wednesday into Thursday.  The rain will be heavy enough to produce heavy rain over the 
area.  By Friday, an approaching front will aid in producing light rain along the Pacific Northwest 
Coast.

For Alaska, low pressure over the Bering Sea on Monday will move over the Southwest mainland on 
Tuesday and along the Gulf of Alaska Coast on Wednesday, before moving farther into the Gulf of 
Alaska on Thursday into Friday.  The low will produce snow over the Southwest Mainland and coastal 
rain and higher elevation snow on Monday.  The area of deep low pressure will help produce high 
winds over the Aleutians into the Alaska Peninsula on Monday.  As the low move to the Gulf of 
Alaska Coast, snow will develop over parts of the Interior, the South-Center Mainland, and the 
Panhandle. The snow will wane over most of the state from Tuesday into Wednesday.  The snow will 
return to the Southwest Mainland on Thursday, moving to the South-Center Mainland and the Panhandle 
on Friday.

Ziegenfelder