US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
232 PM EST Fri Feb 22 2019
 
Valid Monday February 25 2019 - Friday March 01 2019
 
Hazards:
Heavy precipitation across portions of California and the Pacific Northwest, Mon-Thu, Feb 25-Feb 28.
Heavy snow across portions of California, the Central Great Basin, the Pacific Northwest, the 
Northern Rockies, and the Northern Great Basin, Mon-Tue, Feb 25-Feb 26.
Heavy snow across portions of the Central Rockies, the Central Great Basin, the Northern Rockies, 
the Northern Great Basin, and the Northern Plains, Mon-Thu, Feb 25-Feb 28.
Flooding possible across portions of the Central Plains, the Lower Mississippi Valley, the Central 
Appalachians, 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.
Flooding likely across portions of the Ohio Valley.
High winds across portions of the Great Lakes, the Mid-Atlantic, the Northeast, and the Central 
Appalachians, Mon-Tue, Feb 25-Feb 26.
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, Mon-Thu, Feb 25-Feb 28.
Heavy precipitation across portions of mainland Alaska and the Aleutians, Mon, Feb 25.
 and Wed-Thu, Feb 27-Feb 28.
High winds across portions of mainland Alaska and the Aleutians, Mon-Fri, Feb 25-Mar 1.
Much above normal temperatures across portions of mainland Alaska, Mon-Fri, Feb 25-Mar 1.
High significant wave heights for coastal portions of mainland Alaska and the Aleutians, Mon-Thu, 
Feb 25-Feb 28.
 
Detailed Summary:

Deep low pressure over Southeastern Canada and the associated pressure gradient will aid in 
producing high wind across parts of the Lower Great Lakes to Northern New England on Monday.  
Another area of low pressure moving onshore over the Pacific Northwest will move inland to the 
Central High Plains by Wednesday.  A plume of moisture associated with the system will aid in 
producing an area of heavy precipitation over parts of Northern California and Southern Oregon with 
snow at the higher elevations and rain elsewhere that will continue through Thursday.  The storm 
will also produce heavy snow over parts of the Cascades into the Shasta and the Northern Sierra on 
Monday into Thursday.  Heavy snow will also develop over parts of the Central Rockies from Monday 
into Thursday.     

Additionally, with a persistent upper-level trough over the western third of the country and arctic 
high pressure will produce a region of much below normal temperatures from the Upper Great 
Lakes/Upper Mississippi Valley westward to the Northern Intermountain Region and southward to the 
Central Plains Monday into Thursday.     

For Alaska, a storm over the Central-North Pacific will move into the Bering Sea that will bring 
high winds and some precipitation to parts of the Aleutians, Alaska Peninsula region, and the 
Western Alaska mainland through Friday 01 March 2019.  The strong persistent upper-level ridge 
situated over the North Pacific into 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.


Ziegenfelder