US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
401 PM EDT Wed Oct 13 2021
 
Valid Saturday October 16 2021 - Wednesday October 20 2021
 
Hazards:
- Heavy rain across portions of the Great Lakes, the Northeast, and the Pacific Northwest, Sat, Oct 
16.
- Flooding possible across portions of the Southern Plains.
- Flooding occurring or imminent across portions of the Southeast.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Mon-Wed, Oct 
18-Oct 20.
- Heavy precipitation across portions of mainland Alaska, Sun, Oct 17.
- High winds across portions of mainland Alaska and the Aleutians, Sat-Sun, Oct 16-Oct 17.
 
Detailed Summary:

On Saturday, a front extending from the Lower Great Lakes to the Southeast will move off the East 
and most of the Gulf Coast by Sunday.  Moisture pooling along the front will produce an area of 
heavy rain from parts of the Lower Great Lakes to the Northeast on Saturday.  High pressure will 
sit over parts of the Southern Plains to the Northern Rockies, also on Saturday.  Moreover, the 
pressure gradient associated with the related surface low will produce strong wind over parts of 
the Lakes Huron, Michigan, and Erie on Saturday into Sunday evening.

On Saturday, a second front moving onshore over the Pacific Northwest will advance eastward to the 
Upper Great Lakes to the Southern Plain by Wednesday. The system will produce heavy rain over the 
Olympic Peninsula on Saturday. Yet, as the boundary moves east, the front will be mainly dry until 
running into some moisture over Southern/Central Plains into the Middle Mississippi Valley on 
Tuesday.

Over Alaska, a deep area of low pressure moving off the Asian continent will move into the Bering 
Sea on Saturday and cross the Aleutians on Sunday.  The very strong pressure gradient associated 
with the surface low will produce high winds across the Aleutians on Saturday and Sunday.  Also, on 
Sunday, the models have come into better agreement with heavy precipitation across the southern and 
western parts of Kodiak Island and the Kenai Peninsula. Moreover, as the low moves into the Gulf of 
Alaska, heavy precipitation will develop over parts of the Panhandle to just east of Valdez on 
Monday into Wednesday.

Ziegenfelder