US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
348 PM EST Fri Jan 18 2019
 
Valid Monday January 21 2019 - Friday January 25 2019
 
Hazards:
Heavy rain across portions of the Lower Mississippi Valley, the Tennessee Valley, the Pacific 
Northwest, the Middle Mississippi Valley, the Mid-Atlantic, the Southern Appalachians, the 
Southeast, the Southern Plains, and the Ohio Valley, Mon-Tue, Jan 21-Jan 22.
Heavy rain across portions of the Southeast, the Southern Appalachians, the Mid-Atlantic, the 
Northeast, and the Central Appalachians, Wed-Thu, Jan 23-Jan 24.
Heavy snow across portions of the Pacific Northwest and the Northern Great Basin, Tue-Wed, Jan 
22-Jan 23.
Heavy snow across portions of the Northern Rockies and the Northern Great Basin, Tue-Thu, Jan 
22-Jan 24.
Heavy snow across portions of the Central Rockies, the Central Great Basin, the Northern Rockies, 
and the Northern Great Basin, Wed-Thu, Jan 23-Jan 24.
Heavy snow across portions of the Southern Rockies, the Central Rockies, the Central Great Basin, 
and the Southwest, Mon-Tue, Jan 21-Jan 22.
Heavy snow across portions of the Middle Mississippi Valley, the Great Lakes, the Upper Mississippi 
Valley, and the Northern Plains, Mon-Wed, Jan 21-Jan 23.
Heavy snow across portions of the Mid-Atlantic, the Northeast, and the Great Lakes, Wed-Fri, Jan 
23-Jan 25.
Flooding possible across portions of the Mid-Atlantic and the Northeast.
Flooding occurring or imminent across portions of the Southeast, the Lower Mississippi Valley, and 
the Southern Plains.
High winds across portions of the Central Plains, the Mid-Atlantic, the Lower Mississippi Valley, 
the Northern Plains, the Middle Mississippi Valley, the Northeast, the Upper Mississippi Valley, 
and the Southern Plains, Mon-Tue, Jan 21-Jan 22.
Much below normal temperatures across portions of the Mid-Atlantic, the Northeast, the Central 
Appalachians, the Lower Mississippi Valley, the Southeast, and the Great Lakes, Mon-Tue, Jan 21-Jan 
22.
Enhanced wildfire risk across portions of the the Southern Plains and the Southwest, Mon, Jan 21.
Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Wed-Fri, Jan 
23-Jan 25.
High winds across portions of mainland Alaska and the Aleutians, Mon-Tue, Jan 21-Jan 22.
 
Detailed Summary:

Deep low pressure over the Canadian Maritimes will move northeastward to the Labrador Sea by 
Tuesday. The system will produce heavy snow over parts of the Northeast on Monday. In the wake of 
the low pressure, cold air will move into the Northeast as a cold area of high pressure moves 
eastward from Great Lakes into the Mid-Atlantic by Tuesday. The cold high pressure will producing 
an area of much below normal temperatures from the on Monday into Tuesday. In addition, high wind 
will also accompany the low over the Mid-Atlantic/New England Coast on Monday.  Elsewhere, low 
temperatures along the Central Gulf Coast will be the first time temperatures will be below 
freezing on Monday morning, therefor, a region of much below normal was put along the coast.  

A second area of low pressure over the Northern/Central Rockies on Monday will move northeastward 
to Ontario by Wednesday. The system will produce heavy snow over parts of the Central Rockies on 
Monday. As the low moves eastward, another area of heavy snow will develop over parts of the Upper 
Mississippi Valley/Great Lakes on Monday into Wednesday. The storm will also produce a third area 
of heavy snow over parts of the Northeast on Wednesday into Thursday.  An area of heavy rain will 
develop over parts of Tennessee/Lower Mississippi Valleys on Monday. Additionally, a wave of low 
pressure developing over the interior Central Gulf Coast, on Wednesday, will move northeastward to 
the Northern Mid-Atlantic Coast by Thursday.  The low will aid in producing heavy rain over parts 
of the Eastern Gulf Coast and from the Southern Appalachians to parts of New England on Wednesday 
into Thursday.  In addition, a strong pressure gradient over the Central Plains/Middle Mississippi 
Valley will aid in producing high wind over the region on Monday. 

Onshore flow will aid in producing coastal heavy rain and heavy snow over the Northern Cascades on 
Monday into Wednesday.  A front moving inland over the West Coast will aid in producing heavy snow 
over the Sierras into the Cascades on Sunday. Upslope flow will aid in producing an area of heavy 
snow over parts of Idaho on Tuesday into Wednesday. Another area of upslope flow will aid in 
producing heavy snow over parts of the Northern Rockies on Wednesday into Thursday. 

A deep low near the Aleutian Islands will aid in producing high wind over the area on Monday. The 
low pressure will impact the Alaska Peninsula and the Gulf of Alaska streaming moisture in to 
Kodiak Island and Kenai Peninsula eastward to Yakutat that will have heavy precipitation in the 
form of lower elevation rain and snow from Wednesday into Friday.


Ziegenfelder