US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
328 PM EST Tue Feb 04 2020
 
Valid Friday February 07 2020 - Tuesday February 11 2020
 
Hazards:
- Heavy precipitation across portions of the Pacific Northwest and the Northern Great Basin, 
Fri-Sat, Feb 7-Feb 8.
- Heavy rain across portions of the Lower Mississippi Valley, the Tennessee Valley, the Middle 
Mississippi Valley, the Southern Appalachians, the Southeast, the Southern Plains, and the Ohio 
Valley, Mon-Tue, Feb 10-Feb 11.
- Heavy snow across portions of the Central Plains, the Central Great Basin, the Northern Plains, 
the Northern Rockies, the Central Rockies, and the Northern Great Basin, Fri-Sat, Feb 7-Feb 8.
- Heavy snow across portions of the Central Rockies, the Central Plains, the Northeast, and the 
Great Lakes, Fri, Feb 7.
- Flooding possible across portions of the Northeast, the Central Appalachians, the Mid-Atlantic, 
the Southern Appalachians, the Southeast, and the Pacific Northwest.
- Flooding occurring or imminent across portions of the Lower Mississippi Valley and the Northern 
Plains.
- Flooding likely across portions of the Southeast, the Mid-Atlantic, and the Pacific Northwest.
- High winds across portions of mainland Alaska and the Aleutians, Fri-Mon, Feb 7-Feb 10.
- Much below normal temperatures across portions of mainland Alaska, Fri-Sat, Feb 7-Feb 8.
 
Detailed Summary:

A rapidly deepening low pressure system tracking north and east along the Northeast coast Friday 
morning will be responsible for periods of heavy snow in northern New England and a swath of wintry 
mix through central New England. In addition to the disruptive snowfall accumulations, gusty winds 
behind the system will lead to reduced visibility from blowing snow with locally higher snow 
drifts. Snow will taper off late Friday as high pressure over the Great Lakes slides overhead on 
Saturday.

Friday also looks wintry our west as a wave of low pressure along a front extending from the 
Northwest into the Central Plains will generate heavy snow over parts of the northern and central 
Rockies. By late Friday and into early Saturday, a new storm system will slam into the Pacific 
Northwest and southern British Columbia sending more rain and heavy mountain snow across the 
Olympics and Cascades. Moisture associated with this storm will reach the higher elevations of 
western Oregon, northern Idaho, and into western Montana and Wyoming where more heavy mountain snow 
may occur. 

By the start of next week, a long-wave trough over the western U.S. and a dome of high pressure 
over the western Atlantic will work together to funnel subtropical moisture into the southern U.S. 
This setup favors another opportunity for heavy rainfall, particularly in the Mid-South. Accounting 
for recent heavy rainfall, there could be a threat for additional flooding as well as thunderstorms 
in parts of the Mid-South and Lower Mississippi Valley early next week.

Over Alaska, as one low pressure system dissipates near the southwest coast early Friday, a more 
powerful storm will take center stage in the eastern Bering Sea late Friday into early Saturday 
with strong winds expected from the Aleutians to the southwest coast. A second intense storm system 
will move into the Aleutians by Monday and linger into Tuesday leading to additional heavy showers 
and strong winds. Further north, bitterly cold temperatures will continue Friday and into early 
Saturday along the west and northern coasts. Temperatures will moderate throughout the weekend as 
Pacific air streams across the state due to the series of storms systems battering the Aleutians 
this weekend and early next week. 

Mullinax