US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
138 PM EST Fri Nov 29 2019
 
Valid Monday December 02 2019 - Friday December 06 2019
 
Hazards:
- Heavy precipitation across portions of California, the Central Great Basin, the Pacific 
Northwest, and the Southwest, Mon, Dec 2 and Fri, Dec 6.
- Heavy rain across portions of California, Wed, Dec 4.
- Heavy snow across portions of the Mid-Atlantic and the Northeast, Mon-Tue, Dec 2-Dec 3.
- Flooding possible across portions of the Northern Plains.
- Flooding occurring or imminent across portions of the Northern Plains.
- Flooding likely across portions of the Northern Plains and the Southwest.
- High winds across portions of the Northeast, Mon-Tue, Dec 2-Dec 3.
- Much below normal temperatures across portions of the Southeast and the Lower Mississippi Valley, 
Tue, Dec 3.
- Heavy precipitation across portions of the Alaska Panhandle, Mon, Dec 2.
- High winds across portions of mainland Alaska and the Aleutians, Fri, Dec 6.
 
Detailed Summary:

The powerful low pressure system forecast to bring blizzard conditions across the north-central 
U.S. this weekend will bring hazardous weather into the Northeast on Monday and Tuesday, Dec 2-Dec 
3. Heavy snow is currently expected from northern New Jersey/northeast Pennsylvania to eastern 
Maine, with the highest confidence for impactful snowfall across the Hudson Valley and western 
Massachusetts. Confidence decreases along the I-95 corridor from New York City to Boston, as any 
subtle shift could move the rain/snow line further inland or southeast to the coast. High winds 
will make conditions worse along Cape Cod and portions of eastern New England.

Across the western U.S., multiple weather systems will make for a wet and snowy first week of 
December. Heavy precipitation will come to an end on Monday across northern and central California. 
Heavy snow will be the main hazard across the Sierra during this time frame. Another round of heavy 
rain and mountain snow is forecast to enter the region by the end of the week. Further south, an 
upper-level low is forecast to move across southern California on Wednesday. After a wet end to 
November, another 1 to 2 inches of rain is possible.

The largest negative temperature anomalies across the lower 48 during the medium range period will 
be across the Southeast and Lower Mississippi Valley on Tuesday. Low temperatures could touch the 
freezing mark as far south as Mobile, Alabama and Tallahassee, Florida. Low temperatures in the 30s 
will also be found across northern Florida, with 40s and 50s across central and southern Florida. 
These temperatures would be around 10 to 15 degrees below average.

Alaska is forecast to see one strong low pressure system exiting the area on Monday and another 
entering on Friday. The first will continue to bring heavy precipitation to the Alaskan Panhandle, 
with two inches of total liquid equivalent rain/snow possible. The second system entering the 
region on Friday could bring strong winds across the Aleutians before possibly bringing more 
widespread impacts next weekend.    

Snell