US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
338 PM EST Tue Feb 26 2019
 
Valid Friday March 01 2019 - Tuesday March 05 2019
 
Hazards:
Heavy rain across portions of California, the Pacific Northwest, and the Southwest, Sat-Sun, Mar 
2-Mar 3.
and Tue, Mar 5.
Heavy rain across portions of the Southeast and the Mid-Atlantic, Sun-Mon, Mar 3-Mar 4.
Heavy snow across portions of the Central Great Basin, the Northern Great Basin, the Central 
Rockies, California, the Pacific Northwest, and the Southwest, Sat-Mon, Mar 2-Mar 4.
Heavy snow across portions of the Southern Rockies, the Central Rockies, the Central Great Basin, 
the Central Plains, and the Southwest, Fri-Tue, Mar 1-Mar 5.
Heavy snow across portions of the Upper Mississippi Valley and the Northern Plains, Fri, Mar 1.
Heavy snow across portions of the Southern Appalachians, the Mid-Atlantic, the Central 
Appalachians, the Ohio Valley, and the Tennessee Valley, Sun-Mon, Mar 3-Mar 4.
Heavy snow across portions of the Mid-Atlantic, the Northeast, and the Great Lakes, Sat-Sun, Mar 
2-Mar 3.
Heavy snow across portions of the Mid-Atlantic and the Northeast, Mon, Mar 4.
Flooding possible across portions of the Southeast.
Flooding occurring or imminent across portions of the Lower Mississippi Valley, the Tennessee 
Valley, the Middle Mississippi Valley, the Mid-Atlantic, the Southern Appalachians, the Southeast, 
the Pacific Northwest, and the Ohio Valley.
Flooding likely across portions of the Southeast.
Much below normal temperatures across portions of the Central Plains, the Great Lakes, the Lower 
Mississippi Valley, the Central Appalachians, the Northern Plains, the Tennessee Valley, the 
Pacific Northwest, the Northern Rockies, the Central Rockies, the Middle Mississippi Valley, the 
Northeast, the Southern Appalachians, the Northern Great Basin, the Upper Mississippi Valley, the 
Mid-Atlantic, the Southern Plains, and the Ohio Valley, Fri-Tue, Mar 1-Mar 5.
High winds across portions of the Aleutians, Sat-Mon, Mar 2-Mar 4.
High significant wave heights for coastal portions of mainland Alaska, Fri, Mar 1.
 and Mon, Mar4.
 
Detailed Summary:

Arctic air is expected to return for the medium range period as a cold high pressure system from 
Canada is forecast to dominate much of the northern and central U.S. through early next week.  A 
large area of much below normal temperatures is shown on the WPC hazards chart where actual 
temperatures could be more than 40 degrees below normal over the northern and central High Plains.  
This would equate to high temperatures between -10 F and 10 F.

A clipper low pressure system ahead of the aforementioned arctic outbreak will bring a quick round 
of snow across the Midwest on Saturday followed by New England from Saturday night into Sunday.  In 
the meantime, moisture from the next Pacific cyclone should reach California on Saturday.  Rain 
could be heavy over the lower elevations while Sierra Nevada will likely see heavy snow into 
Sunday.  The moisture will then carried eastward rapidly across the Great Basin and central Rockies 
through the weekend, with the chance of heavy snow most likely over Colorado.  By Sunday night, a 
round of snow will likely move across the central Plains as the arctic air mass surges down the 
Plains.  Thereafter, models are indicating an increasing likelihood of a snow event spreading from 
the Tennessee Valley across the central Appalachians Sunday night, and into the Mid-Atlantic and 
possibly further up into southern New England on Monday, but uncertainties remain high at this 
point.  Another area of snow could develop on Tuesday over the central High Plains as an upslope 
flow develops toward the central Rockies.

For western Alaska and the Aleutians, high winds will be likely through the weekend into Monday 
thanks to a strong low pressure system moving into the Bering Sea.  Significant waves are also 
possible on Friday and on next Monday near the coast of western Alaska.


Kong