US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
247 PM EST Fri Jan 24 2020
 
Valid Monday January 27 2020 - Friday January 31 2020
 
Hazards:
- Heavy precipitation across portions of Northern California, the Central Great Basin, the Pacific 
Northwest, and the Northern Great Basin, Mon-Fri, Jan 27-Jan 31.
- Heavy snow across portions of the Central Rockies, the Central Great Basin, the Northern Rockies, 
and the Northern Great Basin, Tue-Wed, Jan 28-Jan 29.
- Heavy snow across portions of the Northern Rockies and the Northern Great Basin, Mon-Thu, Jan 
27-Jan 30.
- Flooding occurring or imminent across portions of the Lower Mississippi Valley, the Northern 
Plains, the Tennessee Valley, the Great Lakes, the Middle Mississippi Valley, the Pacific 
Northwest, and the Ohio Valley.
- High winds across portions of the Central Rockies, the Central Plains, the Central Great Basin, 
the Northern Plains, and the Northern Rockies, Thu-Fri, Jan 30-Jan 31.
- Heavy precipitation across portions of the Alaska Panhandle, Thu-Fri, Jan 30-Jan 31.
- Heavy snow across portions of the Alaska Panhandle and mainland Alaska, Mon-Wed, Jan 27-Jan 29.
- High winds across portions of the Alaska Panhandle, mainland Alaska, and the Aleutians, Mon-Fri, 
Jan 27-Jan 31.
- Much below normal temperatures across portions of mainland Alaska, Mon-Wed, Jan 27-Jan 29.
 
Detailed Summary:

Over the Pacific Northwest on Monday, one front after another will move onshore produce heavy 
precipitation over the area from Monday into Friday. In Addition, heavy snow will develop over 
parts of the Northern Rockies into parts of the Great Basin from Monday into Thursday. The 
associated plumes of moisture will have higher moisture content with an atmospheric river moving 
into the Northwest Coast by Thursday into Friday. Additionally, a tight pressure gradient over the 
Northern High Plains into the Northern Rockies between high pressure over the Great Basin and low 
pressure over North-Central Canada the boundary level wind will be strong enough to meet the 
criteria for high winds on Thursday into Friday.

In Alaska, much below normal temperatures are likely on Monday to Wednesday across most of the 
Mainland. Minimum and maximum temperature anomalies could be 20 to 30+ degrees below normal. An 
upper-level low will become established over the Mainland/Gulf of Alaska Coast form Sunday into 
Tuesday. The upper-level low will slowly weaken on Wednesday into Thursday. The below normal 
temperature anomalies will lessen on Wednesday into Thursday. The models are coming into good 
agreement with the placement of snow over the Alaska mainland from Kenai Peninsula to just west of 
Yakutat northward to the Alaska Range from Monday into Wednesday. As the next system moves into the 
Gulf of Alaska, a plume of moisture will stream into the Alaska Panhandle producing an area of 
heavy precipitation from Thursday into Friday.  Furthermore, with the strong pressure gradient 
associated with the strong areas of low pressure an area of high winds will extend from parts of 
the Aleutian Islands to Yakutat from Monday through Friday.

Ziegenfelder