US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
319 PM EST Wed Jan 29 2020
 
Valid Saturday February 01 2020 - Wednesday February 05 2020
 
Hazards:
- Heavy precipitation across portions of the Pacific Northwest and the Northern Great Basin, 
Sat-Mon, Feb 1-Feb 3and Tue-Wed, Feb 4-Feb 5.
- Heavy precipitation across portions of the Northern Plains, the Northern Rockies, and the 
Northern Great Basin, Sun-Mon, Feb 2-Feb 3.
- Heavy precipitation across portions of the Central Rockies, the Central Plains, and the Central 
Great Basin, Mon-Tue, Feb 3-Feb 4.
- Flooding possible across portions of the Pacific Northwest and the Northern Great Basin.
- Flooding occurring or imminent across portions of the Middle Mississippi Valley, the Lower 
Mississippi Valley, and the Northern Plains.
- Flooding likely across portions of the Pacific Northwest.
- Heavy precipitation across portions of mainland Alaska and the Aleutians, Sun, Feb 2.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Mon-Tue, Feb 
3-Feb 4.
- High winds across portions of mainland Alaska and the Aleutians, Sat-Sun, Feb 1-Feb 2.
- Much below normal temperatures across portions of mainland Alaska, Sat, Feb 1.
- Much below normal temperatures across portions of mainland Alaska, Sat-Mon, Feb 1-Feb 3.
- High significant wave heights for coastal portions of mainland Alaska and the Aleutians, Sun-Mon, 
Feb 2-Feb 3.
 
Detailed Summary:

Alaska is more active than the contiguous U.S..  An ares of deep low pressure over the North 
Pacific will move eastward into the Alaska mainland and weaken significantly by Wednesday.  The 
tight pressure gradient associated with the deep low will produce high wind across parts of the 
Aleutians and parts of the Alaska mainland on Saturday and Sunday.  Related to the high wind, there 
will be significant waves along the Aleutians as the deep low goes by on on Sunday and Monday.  
Furthermore, a plume of moisture associated with the system will move into the Aleutians and parts 
of the southern Alaska mainland that will aid in producing heavy precipitation across parts of the 
southern Alaska mainland on Sunday into Monday.  Additionally, the plume of moisture will move into 
the Alaska Panhandle on Monday and Tuesday.  The moisture and the system will aid in producing an 
area of heavy precipitation over the Alaska Panhandle on Monday into Tuesday as well.  In addition, 
a deep upper-level troughing followed by a deep upper-level low will move over the Bering Sea and 
the western Alaska mainland on Saturday into Wednesday.  The deep troughing will aid in allowing 
the temperatures to be much below normal for the southwestern portion of the Alaska mainland on 
Saturday.  A second area of much below normal temperatures is depicted over the Alaska mainland 
south of the Brooks Range and north of the Alaska Range westward to the Bering Sea from Saturday 
into Monday.  

The contiguous U.S., is generally quiet From Saturday into Wednesday.  A persistent plume of 
moisture will stream into the Pacific Northwest, which should lead to heavy snow in higher 
elevations of the Cascades and localized heavy rain in lower elevations.  Some precipitation could 
spread into the Northern Rockies as well.  A deep upper-level trough will move over the Western U. 
S. on Sunday into Wednesday.  The trough will aid in producing heavy precipitation over several 
different areas of the Northern Rockies into the Central Rockies, likewise, from Sunday into 
Wednesday.  

Ziegenfelder