US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
238 PM EST Mon Dec 09 2019
 
Valid Thursday December 12 2019 - Monday December 16 2019
 
Hazards:
- Heavy precipitation across portions of California, the Pacific Northwest, and the Northern Great 
Basin, Thu-Fri, Dec 12-Dec 13.
- Heavy precipitation across portions of the Northeast and the Great Lakes, Sat-Sun, Dec 14-Dec 15.
- Heavy rain across portions of the Southeast, the Lower Mississippi Valley, the Southern 
Appalachians, and the Tennessee Valley, Mon, Dec 16.
- Heavy rain across portions of the Northeast, the Central Appalachians, the Tennessee Valley, the 
Mid-Atlantic, the Southern Appalachians, and the Southeast, Fri-Sat, Dec 13-Dec 14.
- Heavy snow across portions of the Central Rockies, the Northern Plains, the Northern Rockies, and 
the Northern Great Basin, Thu-Fri, Dec 12-Dec 13.
- Heavy snow across portions of the Central Great Basin, Fri-Sat, Dec 13-Dec 14.
- Heavy snow across portions of the Central Rockies, the Central Plains, and the Central Great 
Basin, Fri-Sun, Dec 13-Dec 15.
- Flooding occurring or imminent across portions of the Northern Plains.
- Much below normal temperatures across portions of the Great Lakes, the Upper Mississippi Valley, 
and the Northern Plains, Thu, Dec 12.
 
Detailed Summary:

The medium range period (Thursday, Dec. 12 to Monday, Dec. 16) will feature precipitation hazards 
across both the eastern and western United States. Meanwhile, one last day of well below normal 
temperatures will be found across the Upper Midwest and Upper Great Lakes. Temperatures are 
forecast to be around 10 to 20 degrees below normal on Thursday, but will recover rapidly by the 
weekend as a warm front lifts northward. 

Heavy rain is expected to impact nearly the entire East Coast, from the eastern Gulf Coast to 
southern New England, as a potent low pressure system moves north on Friday and Saturday. A 
widespread area of 1 to 2 inches of rain is likely, with freezing rain possible at the onset across 
the higher elevations and areas just to the east of the Appalachians. Further north, heavy snow and 
a wintry mix is more likely across the Interior Northeast and northern Maine on Saturday and 
Sunday, but even these areas could switch over to plain rain. By Monday, another round of heavy 
rain is possible across the Southeast and Lower Mississippi Valley, with light snow possible to the 
north.

Across the western U.S., heavy precipitation (mountain snow and coastal/valley rain) will likely 
impact the Pacific Northwest on Thursday and Friday. Upwards of 2 inches of total precipitation 
will be possible here. As the moisture works inland, heavy snow (greater than 8 inches) could fall 
across portions of the Northern Rockies. Higher elevations of Colorado could see snow linger into 
early next week. 

No hazards are currently expected across Alaska during these dates.

Snell