US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
228 PM EST Fri Feb 15 2019
 
Valid Monday February 18 2019 - Friday February 22 2019
 
Hazards:
Heavy rain across portions of the Lower Mississippi Valley, the Tennessee Valley, the Mid-Atlantic, 
the Southern Appalachians, the Southeast, and the Ohio Valley, Tue-Fri, Feb 19-Feb 22.
Heavy snow across portions of the Northeast, the Central/Northern Appalachians Tue-Thu, Feb 19-Feb 
21.
Heavy snow across portions of the Central Rockies, the Central Great Basin, the Southern Rockies, 
and the Southwest, Mon-Tue, Feb 18-Feb 19.
and Thu-Fri, Feb 21-Feb 22.
Flooding possible across portions of the Middle Mississippi Valley, the Great Lakes, 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 Southern Rockies, the Central Great Basin, and the Southwest, 
Thu-Fri, Feb 21-Feb 22.
Much below normal temperatures across portions of the Central Plains, the Central Great Basin, the 
Northern Plains, the Southern Plains, the Northern Rockies, the Central Rockies, the Middle 
Mississippi Valley, California, the Northern Great Basin, the Upper Mississippi Valley, the Pacific 
Northwest, and the Southwest, Mon-Wed, Feb 18-Feb 20.
High winds across portions of mainland Alaska, Mon-Thu, Feb 18-Feb 21.
High winds across portions of the Aleutians, Mon-Fri, Feb 18-Feb 22.
High significant wave heights for coastal portions of mainland Alaska and the Aleutians, Mon, Feb 
18.
 and Fri, Feb22.
 
Detailed Summary:

Cold high pressure and upper-level troughing will aid in producing a broad region of much below 
normal temperatures extending from east of the Rockies to the Northern Plains to parts of the 
Southern Plains from Monday into Wednesday. In addition, from the west side of the Rockies across 
parts of the Northern Intermountain Region/Great Basin into parts of the Pacific Northwest and 
California, likewise, from Monday into Wednesday.

A wave of low pressure over the Mid-Atlantic will move off the Mid-Atlantic overnight Sunday 
followed by another wave of low pressure over the Northern Mexico, on Tuesday, that will move 
northeastward to the Mid-Atlantic by Thursday exiting off the coast overnight Thursday. The systems 
will aid in producing area of heavy rain greater than one inch from the Lower Mississippi Valley 
northeastward to the Southern Appalachians from Monday to Friday. The greatest extent of the one 
inch or greater will be on Wednesday continuing into Friday.  The second area of low pressure will 
produce an area of heavy snow over parts of the Central Appalachians into parts of the Northern 
Appalachians on Tuesday into Thursday.

Low pressure over the Southwest/Southeastern California on Monday into Tuesday will produce a 
region of heavy snow over parts of the Mogollon Rim through Tuesday.  The heavy snow will also 
develop over parts of the Central/Southern Rockies on Monday into Tuesday.  Another area of low 
pressure will move over the Southwest/Southeastern California on Thursday into Friday that will aid 
in producing an area of heavy snow over the Mogollon Rim into parts of the Central/Southern Rockies 
on Thursday into Friday.

For Alaska, Multiple areas of low pressure over the North-Central Pacific will move northward into 
the Bering Sea by Tuesday then inland over Alaska by Thursday followed by a second low on Thursday 
that will aid in producing High Wind of 50 knots and significant waves of 20 feet or greater from 
Monday into Friday from the Aleutians to the Alaska Peninsula. 

Ziegenfelder