US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
301 PM EST Thu Feb 14 2019
 
Valid Sunday February 17 2019 - Thursday February 21 2019
 
Hazards:
Heavy rain across portions of the Lower Mississippi Valley, the Central Appalachians, the Tennessee 
Valley, the Mid-Atlantic, the Southern Appalachians, the Southeast, and the Ohio Valley, Sun-Thu, 
Feb 17-Feb 21.
Heavy snow across portions of California, the Central Great Basin, the Pacific Northwest, and the 
Northern Great Basin, Tue-Thu, Feb 19-Feb 21.
Heavy snow across portions of the Southern Rockies, the Central Rockies, the Southern Plains, the 
Central Plains, and the Southwest, Sun-Tue, Feb 17-Feb 19.
Heavy snow across portions of the Mid-Atlantic, the Central Appalachians, and the Ohio Valley, 
Tue-Wed, Feb 19-Feb 20.
Flooding occurring or imminent across portions of the Middle Mississippi Valley, the Lower 
Mississippi Valley, the Great Lakes, the Ohio Valley, and the Tennessee Valley.
Flooding likely across portions of the Ohio Valley and the Southwest.
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, Sun-Thu, Feb 17-Feb 21.
Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Sun-Mon, Feb 
17-Feb 18.
High winds across portions of mainland Alaska and the Aleutians, Sun-Thu, Feb 17-Feb 21.
High significant wave heights for coastal portions of mainland Alaska and the Aleutians, Sun-Tue, 
Feb 17-Feb 19.
 
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 Upper/Middle Mississippi Valley and 
parts of the Southern Plains from Sunday into Thursday.  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 Sunday into Thursday.  

A wave of low pressure over the Lower Mississippi Valley will move northeastward to the 
Mid-Atlantic by Monday followed by another wave of low pressure over the Southern High Plains, on 
Tuesday, will move northeastward to the Mid-Atlantic by Wednesday exiting off the coast by 
Thursday.  The systems will aid in producing area of heavy rain greater than one inch from the 
Lower Mississippi Valley northeastward to the Mid-Atlantic from Sunday to Thursday.  The region of 
one inch or greater will be a smaller region nested inside the larger region over parts of the 
Tennessee Valley from Sunday into Tuesday.  The greatest extent of the one inch or greater will be 
on Wednesday.  On Thursday as the storm tapers off, the one inch area will be over the Tennessee 
Valley again by Thursday.  The second area of low pressure will produce an area of heavy snow over 
parts of the Central Appalachians into parts of the Northern Mid-Atlantic on Tuesday into 
Wednesday.   

The second wave of low pressure over the Southwest/Southeastern California on Sunday into Tuesday 
will produce a region of heavy snow over parts of the Mogollon Rim through Tuesday.  Another area 
of heavy snow will also develop over parts of the Central High Plains on Sunday into Tuesday.  

A wave of low pressure along a boundary will move eastward off the East Coast followed by another 
wave of low pressure follow by a third wave of low pressure by Wednesday. By Monday to Wednesday, 
copious amounts of Gulf moisture will return to the Southeastern U.S. ahead of upper-level energy, 
leading to the possibility of heavy rain from the Lower Mississippi Valley eastward into the South 
Mid-Atlantic. Heavy snow is possible from parts of the Northern/Central Plains into parts of the 
Western Ohio Valley on Saturday into Sunday. As the system moves eastward, heavy snow will develop 
over the Western Ohio Valley eastward to parts of the Northeast from Sunday into Wednesday.

For Alaska, a strong low pressure system 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 
will aid in producing High Wind of 50 knots and significant waves of 20 feet or greater from Sunday 
into Thursday from the Aleutians to the Alaska Peninsula and the Southwest Coast of the Alaska 
mainland.  The Southern Coast of Alaska mainland will have Heavy Precipitation from Sunday into 
Monday.  

Ziegenfelder