US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
321 PM EST Mon Nov 08 2021
 
Valid Thursday November 11 2021 - Monday November 15 2021
 
Hazards:
- Heavy rain across portions of the Pacific Northwest, Thu, Nov 11.
- Heavy snow across portions of the Pacific Northwest and the Northern Great Basin, Thu-Fri, Nov 
11-Nov 12.
- Heavy snow across portions of the Pacific Northwest, Thu, Nov 11.
- Flooding occurring or imminent across portions of the Southeast.
 
Detailed Summary:

We're in for a relatively quiet medium range period (Thursday, November 11th - Monday, November 
15th) across the CONUS and Alaska. The Pacific Northwest is likely to be the only region to 
experience hazardous weather during this period, due to persistent troughing and on-shore flow. 
Heavy rain is expected along the Washington state and northern Oregon coasts on Thursday, where 
rainfall amounts are likely to eclipse 2 inches. Heavy snow is likely to overspread much of the 
Cascades and Olympic mountains on Thursday and continuing into Friday for the Cascades. Some light 
snow may make its way into the Rockies on Thursday as well. High pressure builds over California 
and the Great Basin on Friday which will allow for a warmer airmass to develop and expand across 
the entire western U.S.. Meanwhile, a low pressure system will glide across the Mississippi Valley 
and into the Northeast between Thursday and Saturday. Showers and isolated thunderstorms will 
spread from the Mississippi Valley into the East Coast during this period. Confidence is low on the 
development of heavy rain and heavy lake effect snow, particularly in the Northeast on 
Thursday/Friday, due to the qpf model spread. Late week warmth in the east will make way for below 
average temperatures for the Midwest and Southeast this weekend in the wake of the low pressure 
system.

No hazards are forecast for Alaska at this time. A potent low pressure system over the Gulf will 
not produce hazardous high winds for the Gulf coast on Friday. Temperatures over the southwest 
mainland will be below average on Friday as the aforementioned Gulf system pulls in cooler 
continental air to the area on its backside.

Kebede