US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
213 PM EST Fri Jan 04 2019
 
Valid Monday January 07 2019 - Friday January 11 2019
 
Hazards:
Heavy precipitation across portions of California, the Pacific Northwest, and the Northern Great 
Basin, Mon-Thu, Jan 7-Jan 10.
Heavy snow across portions of the Central Great Basin, California, and the Southwest, Wed, Jan 9.
Heavy snow across portions of the Northeast and the Great Lakes, Tue-Wed, Jan 8-Jan 9.
Heavy snow across portions of the Great Lakes, Mon, Jan 7.
Flooding possible across portions of the Southeast, the Mid-Atlantic, the Lower Mississippi Valley, 
and the Tennessee Valley.
Flooding occurring or imminent across portions of the Southeast, the Mid-Atlantic, the Lower 
Mississippi Valley, the Southern Plains, and the Ohio Valley.
Flooding likely across portions of the Southeast, the Middle Mississippi Valley, the Lower 
Mississippi Valley, the Ohio Valley, and the Tennessee Valley.
High winds across portions of California and the Pacific Northwest, Mon-Wed, Jan 7-Jan 9.
High winds across portions of the Central Rockies, the Central Plains, the Great Lakes, the 
Northern Plains, and the Northern Rockies, Mon, Jan 7.
High significant wave heights for coastal portions of California and the Pacific Northwest, 
Mon-Wed, Jan 7-Jan 9.
High significant wave heights for coastal portions of the Aleutians, Mon-Tue, Jan 7-Jan 8.
and Fri, Jan 11.
 
Detailed Summary:

The active weather along the West Coast will continue through the middle-to-end of next week, with 
more heavy rain and mountain snow. Snowfall of 6 inches or more should develop over parts of the 
Sierras on Wednesday. Heavy snow will also reach into the Cascades from Monday until Thursday. Two 
seperate storm systems will bring significant waves and high winds to the immediate coastal areas 
of northern California, Oregon and Washington from Monday to Wednesday.

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. High wind will also be possible across portions of Wyoming as a system exits into the 
Northern Plains. 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 between Monday and Wednesday.

In Alaska, significant waves (>20 ft) will be possible across the western Aleutians Monday and 
Tuesday, and again on Friday. 

Snell