US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
251 PM EST Thu Feb 25 2021
 
Valid Sunday February 28 2021 - Thursday March 04 2021
 
Hazards:
- Heavy rain across portions of the Lower Mississippi Valley, the Central/Southern Appalachians, 
the Tennessee Valley, the Mid-Atlantic, the Southeast, the Southern Plains, and the Ohio Valley, 
Sun-Mon, Feb 28-Mar 1.
- Flooding possible across portions of the Lower Mississippi Valley, the Southern Appalachians, 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, Sun-Mon, Feb 28-Mar 1.
 
Detailed Summary:

The medium-range period (Sunday, February 28 - Thursday, March 4) has a front extending from 
roughly the Great Lakes to the Southern Plains that will move eastward to the 
Northeast/Mid-Atlantic Coast and extend across the Gulf Coast by Monday.

Moisture from the Gulf of Mexico will pool along the boundary, aiding in producing heavy rain over 
parts of Lower Mississippi Valley and the Tennessee/Ohio Valleys into the Central Appalachians on 
Sunday that will taper off on Monday.  The boundary will move southeastward to off the Southeast 
Coast while remaining quasi-stationary across the Gulf Coast on Tuesday and Wednesday.

Waves of low pressure will move along the front on Wednesday and Thursday.  Light rain will 
continue along the Gulf Coast into the Southeast from Tuesday into Thursday. 

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

For Alaska, low pressure over the Gulf of Alaska Coast will move into Canada, producing coastal 
rain as well as interior and higher elevation snow over the Alaska Panhandle.  Another low over 
North Pacific will move into the Bering Sea on Sunday into Monday and along the Gulf of Alaska 
Coast, becoming stationary on Wednesday and Thursday.  The low will produce snow over the Southwest 
Mainland and coastal rain and higher elevation snow 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.

Snow will return to the Southwest Mainland again on Thursday. The areas of deep low pressure will 
help produce high winds over the Aleutians into the Alaska Peninsula on Sunday into Monday.

Ziegenfelder