US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
436 PM EDT Tue Mar 23 2021
 
Valid Friday March 26 2021 - Tuesday March 30 2021
 
Hazards:
- Heavy precipitation across portions of the Northeast, Fri, Mar 26 and Sun, Mar 28.
- Heavy rain across portions of the Southeast, the Lower Mississippi Valley, the Southern 
Appalachians, and the Tennessee Valley, Sat, Mar 27.
- Heavy snow across portions of the Pacific Northwest and the Northern Great Basin, Sun, Mar 28.
- Heavy snow across portions of the Southern Rockies, the Central Rockies, the Central Great Basin, 
and the Southwest, Fri, Mar 26.
- Flooding possible across portions of the Central Plains, the Middle/Lower Mississippi Valley, the 
Tennessee Valley, the Southeast, and the Ohio Valley.
- Flooding occurring or imminent across portions of the Middle Mississippi Valley and the Ohio 
Valley.
- Flooding likely across portions of the Central Plains.
- High winds across portions of the Great Lakes, the Mid-Atlantic, the Northeast, the Central 
Appalachians, and the Ohio Valley, Fri, Mar 26.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Fri-Sat, Mar 
26-Mar 27.
- High winds across portions of mainland Alaska and the Aleutians, Sun-Mon, Mar 28-Mar 29.
 
Detailed Summary:

The medium-range forecast period (Friday, March 26th to Tuesday, March 30th) deep low-pressure over 
the Great Lakes will move eastward to Southeastern Canada by Saturday. The deep low-pressure area 
will produce high wind over the Northeast on Friday due to the strong pressure gradient around the 
low.  The system will produce an area of heavy snow over parts of Northern New England on Saturday.

A front over the Central/Southern Plains on late Friday/early Saturday will move eastward to the 
Lower Great Lakes southwestward to the Lower Mississippi and Tennessee Valleys by Sunday.  Moisture 
from the Western Gulf of Mexico will pool along the boundary developing an area of heavy rain over 
the Tennessee Valley into parts of the Southeast and Central/Southern Appalachians on Saturday. 

A cold front will bring chances for mountain snow and lower elevation rain showers on Friday across 
the western United States. Heavy snow (possibly as much as a foot) will develop across the Central 
Rockies and, more specifically the San Juan Mountains of southwest Colorado. Otherwise, much of the 
region will experience cooler than average temperature to start the forecast period, switching to 
slightly above average by the end of the weekend.

For Alaska, low-pressure over the Gulf of Alaska will move inland only to be replaced by another 
low over the Bering Sea on Friday will move southeastward to the Gulf of Alaska on Saturday.  The 
areas of low-pressure will stream moisture into the Alaska Panhandle on Friday and Saturday, 
producing an area of heavy precipitation over the Alaska Panhandle and bring heavy coastal rain, 
interior and higher elevation snow.  Another area of deep low-pressure over the North Pacific on 
Saturday will move into the Bearing Sea on Sunday, moving to the Southwest Mainland Coast by 
Monday.  The strong pressure gradient around the low will produce high wind over the Aleutians into 
the Alaska Peninsula and parts of the Southwest Mainland on Sunday and Monday.
Ziegenfelder