US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
401 PM EDT Mon Oct 25 2021
 
Valid Thursday October 28 2021 - Monday November 01 2021
 
Hazards:
- Heavy precipitation across portions of the Pacific Northwest, the Northern Rockies, and the 
Northern Great Basin, Thu, Oct 28.
- Heavy rain across portions of the Central/Southern Appalachians, the Tennessee Valley, the 
Mid-Atlantic, the Southeast, and the Ohio Valley, Thu, Oct 28.
- Heavy rain across portions of the Great Lakes, the Mid-Atlantic, the Northeast, the Central 
Appalachians, and the Ohio Valley, Fri-Sat, Oct 29-Oct 30.
- Flooding possible across portions of the Middle Mississippi Valley, the Great Lakes, and the Ohio 
Valley.
- Flooding likely across portions of the Middle Mississippi Valley and the Great Lakes.
- Heavy precipitation across portions of mainland Alaska, Sat-Mon, Oct 30-Nov 1.
- High winds across portions of mainland Alaska and the Aleutians, Fri-Sat, Oct 29-Oct 30.
 
Detailed Summary:

A storm moving into the Pacific Northwest will produce an area of heavy precipitation over parts of 
western Washington State and parts of the Northern Rockies on Thursday.

Meanwhile, an area of low pressure and the associated front over the Middle/Lower Mississippi and 
Tennessee Valleys will draw moisture off the Eastern Gulf of Mexico and the Atlantic Ocean on 
Thursday. The system will produce an area of heavy rain over parts of the Southeast, 
Central/Southern Appalachians, and Ohio Valley on Thursday. Next, the system will move northward 
into the Northeast, pulling moisture inland off the Atlantic over the Mid-Atlantic into the 
Northeast on Friday and Saturday. As a result, an area of heavy rain will develop over parts of the 
northern Mid-Atlantic into parts of the Lower Great Lakes on Friday, then transitions into New 
England by Saturday.

Furthermore, on Thursday, the pressure gradient associated with the low over the Mississippi Valley 
and high pressure over the Northern/Central Rockies will produce breezy conditions over the 
Central/Southern Plains.  Moreover, the front that moves onshore over the Northwest on Thursday 
will move off the East Coast, producing light rain over parts of the Northeast on Monday.

Hazards come back to Alaska as an area of deep low pressure moves just south of the Aleutians on 
Thursday and Friday.  The tight pressure gradient will produce strong wind over the Aleutians into 
parts of the Alaska Peninsula on Friday and Saturday.  Additionally, as the slow-moving area of low 
pressure moves into the Gulf of Alaska, moisture will stream into the coast of the Southern-Central 
Mainland.  The storm will produce an area of heavy precipitation over parts of the windward side of 
the Kenai Peninsula, the Aleutian Mountain Range, and Kodiak Island from Saturday into Monday

Ziegenfelder