US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
344 PM EST Mon Dec 17 2018
 
Valid Thursday December 20 2018 - Monday December 24 2018
 
Hazards:
Heavy rain across portions of the Northeast and the Pacific Northwest, Fri-Sat, Dec 21-Dec 22.
Heavy rain across portions of the Pacific Northwest and the Northern Great Basin, Thu-Sat, Dec 
20-Dec 22.
Heavy rain across portions of the Southeast and the Mid-Atlantic, Thu-Fri, Dec 20-Dec 21.
Severe weather across portions of the Southeast, Thu, Dec 20.
Flooding occurring or imminent across portions of the Southeast, the Central Appalachians, the 
Mid-Atlantic, and the Southern Plains.
Flooding likely across portions of the Southeast and the Mid-Atlantic.
High significant wave heights for coastal portions of the Pacific Northwest, Thu-Fri, Dec 20-Dec 21.
Much below normal temperatures across portions of mainland Alaska, Thu-Fri, Dec 20-Dec 21.
 
Detailed Summary:

A developing storm over the Southeast, Thursday 20 December, will move northeastward to 
Southeastern Canada by Sunday 23 December.  There is a possibility of severe thunderstorms 
associated with the front moving across Florida on Thursday 20 December.  The same storm will 
produce an inch or more of rain over parts of the Mid-Atlantic into the Northeast on Thursday into 
Friday 20-21 December. 

Meanwhile, a storm over the Eastern Pacific will move onshore over the Pacific Northwest on 
Thursday 20 December moving into Western Canada by Friday 21 December.  The system will produce an 
inch or more of rain over parts of the Pacific Northwest on Thursday into Friday 21-22 December.  
In addition, high wind offshore will aid in producing significant waves along or near parts of the 
Pacific Northwest Coast on Thursday 20 December.

Additionally, cold air associated with a deep upper-level low over Central Alaska will aid in 
producing much below normal temperatures over Southwestern Alaska on Thursday 20 December.    


Ziegenfelder