US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
218 PM EST Wed Jan 30 2019
 
Valid Saturday February 02 2019 - Wednesday February 06 2019
 
Hazards:
Heavy precipitation across portions of the Pacific Northwest, Sat, Feb 2.
Heavy precipitation across portions of California, Sat-Mon, Feb 2-Feb 4.
Heavy precipitation across portions of the Great Lakes and the Upper Mississippi Valley, Mon-Tue, 
Feb 4-Feb 5.
Heavy rain across portions of the Lower Mississippi Valley, the Tennessee Valley, the Mid-Atlantic, 
the Southern Appalachians, the Southeast, and the Ohio Valley, Mon-Wed, Feb 4-Feb 6.
Heavy snow across portions of the Central Great Basin, California, and the Southwest, Sat-Mon, Feb 
2-Feb 4.
Heavy snow across portions of the Great Lakes and the Upper Mississippi Valley, Wed, Feb 6.
Flooding occurring or imminent across portions of the Southeast and the Great Lakes.
High winds across portions of the Southern Rockies, the Central Plains, the Southern Plains, and 
the Southwest, Sun-Mon, Feb 3-Feb 4.
and Tue-Wed, Feb 5-Feb 6.
Much below normal temperatures across portions of the Central Plains, the Northern Plains, the 
Northern Rockies, the Central Rockies, the Middle Mississippi Valley, the Northern Great Basin, the 
Upper Mississippi Valley, and the Pacific Northwest, Sun-Wed, Feb 3-Feb 6.
High winds across portions of the Aleutians, Sat, Feb 2.
Much below normal temperatures across portions of the Alaska Panhandle and mainland Alaska, 
Sat-Mon, Feb 2-Feb 4.
High significant wave heights for coastal portions of the Aleutians, Sat-Sun, Feb 2-Feb 3.
 
Detailed Summary:

The intense arctic outbreak will slide off the northeastern U.S. during the weekend and usher in 
warmer air. The mild air mass will become firmly established across the central and southern Plains 
on Sunday, spreading into the Ohio Valley on Monday, and into much of the eastern and southeastern 
U.S. by Tuesday. Temperatures are forecasts to be 20 to 30 degrees above normal across the 
mid-section of the country Sunday and Monday. The next surge of arctic air from Canada is forecast 
to move into the northern Plains early next week. It appears that this arctic outbreak will be much 
less intense than the current one impacting the Northern Tier, but will still bring anomalously 
cold air.

Out west, moisture ahead of a Pacific cyclone and associated fronts is expected to reach the 
Pacific Northwest on Friday. The core of the storm should impact much of California on Saturday 
into Sunday where heavy rain is possible over the lower elevations while heavy snow is expected 
along the Sierras. Some of the heavy rain could spill into parts of the southern Great Basin on 
Sunday as well.

The associated upper-level trough is forecast to move into the central Plains on Monday and into 
the Great Lakes on Tuesday. Models are showing some discrepancies on the speed and location of 
cyclogenesis of this system. Nevertheless, wintry precipitation appears likely from the upper 
Midwest into the Great Lakes on Monday, reaching New England on Tuesday. Potential exists for the 
wintry precipitation to become heavy across the upper Midwest into the Great Lakes on Monday. 
Meanwhile, heavy rain will be possible across the lower Tennessee Valley. By Tuesday and Wednesday, 
potential exists for another cyclone to intensify over the central Plains, bringing heavy rain 
across the mid-Mississippi Valley into the night-time hours. Both systems will also bring the 
potential for high winds 

In Alaska, much colder than normal temperatures are expected across interior eastern Alaska and the 
Alaskan Panhandle Saturday through Monday. A strong Pacific cyclone is expected to spread 
significant waves and some high winds across western Aleutians Saturday and Sunday.

Snell/Kong