US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
319 PM EST Wed Nov 27 2019
 
Valid Saturday November 30 2019 - Wednesday December 04 2019
 
Hazards:
- Heavy rain across portions of California, Sat-Mon, Nov 30-Dec 2.
- Heavy snow across portions of the Central Great Basin, California, and the Southwest, Sat-Mon, 
Nov 30-Dec 2.
- Heavy snow for parts of the Central Plains, the Great Lakes, the Upper Mississippi Valley, and 
the Northern Plains, Sat, Nov 30.
- Heavy snow across portions of the Great Lakes, the Mid-Atlantic, the Northeast, the Central 
Appalachians, and the Upper Mississippi Valley, Sun-Mon, Dec 1-Dec 2.
- Severe weather for parts of the Southeast, the Lower Mississippi Valley, the Southern Plains, and 
Tennessee Valley, Sat, Nov 30.
- Flooding occurring or imminent across portions of the Northern Plains.
- Flooding likely across portions of the Northern Plains.
- High winds across portions of the Plains, the Central and Southern Rockies, the Central Great 
Basin, the Great Lakes, the Mississippi Valley, the Ohio Valley, and the Southwest, Sat-Sun, Nov 
30-Dec 1.
- Much below normal temperatures across portions of the Central Great Basin, the Northern Rockies, 
California, the Northern Great Basin, the Pacific Northwest, and the Southwest, Sat-Sun, Nov 30-Dec 
1.
- High significant wave heights for coastal portions of the Great Lakes and the Upper Mississippi 
Valley, Sat-Sun, Nov 30-Dec 1.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Sun-Tue, Dec 
1-Dec 3.
 
Detailed Summary:

This period will feature several major weather hazards for the nation. A highly impactful lead 
storm system is forecast will track eastward across the Northern Plains and Midwest this holiday 
weekend. Heavy snow and potential for blizzard conditions are forecast to spread from the Northern 
High Plains to the Great Lakes. This is as high winds also accompany the low pressure system from 
the Rockies and Plains to the Midwest and Great Lakes, where high waves may offer coastal impacts. 
In the Sunday to early Tuesday timeframe, the storm will work toward the Northeast and reform as a 
potent New England coastal storm. This will spread a threat of heavy snow across the interior 
Northeast and offers a maritime/coastal risk of high winds/waves. Significant model spread still 
exists on timing and location of the heaviest snow, however the highest probabilities for impactful 
snowfall are from northern Pennsylvania and Upstate New York into interior New England. Given this 
is a very busy weekend for travel, it is important to consider alternate plans across this region. 
Further south, a severe thunderstorm threat will be in place Saturday from eastern Texas to the 
Lower Mississippi Valley/Gulf Coast States ahead of the trailing and approaching cold front.

Meanwhile, digging eastern Pacific storm energies working into the West Coast are forecast to bring 
heavy rain/mountain snows to the western U.S. from this weekend into early next week. The highest 
amounts are forecast across northern and central California where the threat is maximized. A local 
runoff threat may be enhanced over burn scar areas and cold air further inland will offer much 
below normal temperatures over the north-central Great Basin.

North to Alaska, heavy precipitation is forecast into the southern coast and southeast Panhandle 
Sunday into Tuesday of next week as an organized weather system works eastward across the region. 
This threat includes heavy coastal rain and inland/mountain snow.

Schichtel