US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
258 PM EST Thu Jan 03 2019
 
Valid Sunday January 06 2019 - Thursday January 10 2019
 
Hazards:
Heavy snow across portions of California, the Pacific Northwest, and the Northern Great Basin, 
Sun-Wed, Jan 6-Jan 9.
Flooding possible across portions of the Southeast, the Mid-Atlantic, the Lower Mississippi Valley, 
the Southern Plains, and the Tennessee Valley.
Flooding occurring or imminent across portions of the Central Plains, the Lower Mississippi Valley, 
the Tennessee Valley, the Middle Mississippi Valley, the Mid-Atlantic, the Southeast, and the 
Southern Plains.
Flooding likely across portions of the Southeast, the Southern Plains, the Lower Mississippi 
Valley, and the Central Great Basin.
High winds across portions of California and the Pacific Northwest, Sun-Tue, Jan 6-Jan 8.
High winds across portions of the Great Lakes, Mon, Jan 7.
High significant wave heights for coastal portions of the Pacific Northwest, Mon-Wed, Jan 7-Jan 9.
High significant wave heights for coastal portions of the Aleutians, Sun-Tue, Jan 6-Jan 8.
 
Detailed Summary:

Snowfall of 6 inches or more should develop over parts of the Sierras from Sunday into Monday. The 
active weather will continue through the middle of next week with more heavy rain and mountain 
snow. Heavy snow will also reach into the northern Rockies and northern Great Basin Sunday. Another 
round of heavy snow could develop across portions of the Southern Rockies Sunday into Monday as the 
system pushes east.

A tight pressure gradient over the Upper Great Lakes between high pressure over East-Central Canada 
and low pressure over the Northern Plains/Upper Mississippi Valley will produce high wind on 
Monday.  The low pressure system will track into the Lower Great Lakes by Tuesday and off the New 
England Coast by Wednesday.  Heavy snow will be possible ahead of, and north of the low. 
Uncertainty remains, but the areas with the most likely chance to see 4 inches or more of snow 
include northern Michigan and New England.

In Alaska, significant waves will be possible across the western Aleutians from Sunday until 
Tuesday as multiple storm systems impact the islands.

Snell/Hamrick