US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
239 PM EST Thu Feb 21 2019
 
Valid Sunday February 24 2019 - Thursday February 28 2019
 
Hazards:
Heavy precipitation across portions of California and the Pacific Northwest, Sun-Tue, Feb 24-Feb 26.
Heavy snow across portions of the Central Great Basin, the Northern Plains, the Northern Rockies, 
the Central Rockies, California, the Northern Great Basin, and the Pacific Northwest, Sun-Tue, Feb 
24-Feb 26.
Heavy snow across portions of the Northeast, Sun, Feb 24.
Flooding possible across portions of the Lower Mississippi Valley, the Tennessee Valley, the Middle 
Mississippi Valley, the Mid-Atlantic, the Southern Appalachians, the Southeast, and the Ohio Valley.
Flooding occurring or imminent across portions of the Middle Mississippi Valley, the Lower 
Mississippi Valley, the Ohio Valley, and the Tennessee Valley.
High winds across portions of the Central Plains, the Northeast, the Central Appalachians, the 
Northern Plains, the Middle Mississippi Valley, the Mid-Atlantic, the Upper Mississippi Valley, the 
Great Lakes, and the Ohio Valley, Sun, Feb 24.
Much below normal temperatures across portions of the Central Plains, the Northern Plains, the 
Great Lakes, the Northern Rockies, the Middle Mississippi Valley, the Northern Great Basin, the 
Upper Mississippi Valley, and the Southern Plains, Sun-Thu, Feb 24-Feb 28.
Heavy precipitation across portions of mainland Alaska and the Aleutians, Sun-Mon, Feb 24-Feb 25.
High winds across portions of mainland Alaska and the Aleutians, Sun, Feb 24.
High winds across portions of the Aleutians, Sun-Mon, Feb 24-Feb 25.
and Thu, Feb 28.
Much above normal temperatures across portions of mainland Alaska, Sun-Thu, Feb 24-Feb 28.
High significant wave heights for coastal portions of mainland Alaska and the Aleutians, Sun-Thu, 
Feb 24-Feb 28.
 
Detailed Summary:

A deep surface low exiting the Upper Great Lakes on Sunday (producing heavy snowfall across the 
Central Plains to Upper Midwest at the end of the short range period) will continue to result in 
strong gusty winds across much of the Midwest, Great Lakes, and into parts of the Northeast Sunday 
and into at least the early part of Monday. Accumulating snows may clip northern New England as 
well as this system lifts into eastern Canada and a new surface low forms off the Northeast coast.

Meanwhile, the western U.S. will be dominated by a long-standing wintry upper trough through much 
of the medium range period. This will result in unsettled weather across parts of the Northwest and 
Intermountain West. The best chance for heavy snowfall will be the Cascades into the northern 
Sierra, and eastward into the Northern Rockies with additional rounds of heavy rain/mountain snows 
also possible across parts of northern California and western Oregon. Temperatures across the 
northern tier will be well below normal through the entire period from the Northwest to the 
northern and central Plains as surface high pressure dives southward into the north-central states. 
The core of the cold will be across Montana into the northern Plains Monday-Wednesday next week 
where anomalies could be 20 to 30+ degrees below normal.

For Alaska, one system moving moving through the Bering Sea will bring high winds and some 
precipitation to parts of the Aleutians, Peninsula region, and the western mainland this weekend. A 
second deep surface low follows behind into the Aleutians with another round of high winds and 
significant waves possible for the Island Chain early next week. Strong upper ridging situated over 
central and eastern Alaska will result in an extended period of much above normal temperatures, 
especially across northern Alaska where temperatures could be 40+ degrees above normal, with highs 
approaching or surpassing freezing.

Santorelli