US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
243 PM EST Thu Jan 23 2020
 
Valid Sunday January 26 2020 - Thursday January 30 2020
 
Hazards:
- Heavy precipitation across portions of California, the Pacific Northwest, and the Northern Great 
Basin, Sun-Thu, Jan 26-Jan 30.
- Heavy snow across portions of the Northeast and the Great Lakes, Sun-Mon, Jan 26-Jan 27.
- Flooding occurring or imminent across portions of the Middle Mississippi Valley, the Lower 
Mississippi Valley, the Great Lakes, the Ohio Valley, and the Northern Plains.
- Much below normal temperatures across portions of mainland Alaska, Sun-Wed, Jan 26-Jan 29.
 
Detailed Summary:

A storm over the Northeast, on Sunday, will move eastward to just off the Southeast Coast of Canada 
by Tuesday. The system will produce heavy snow over parts of the Lower Great Lakes/Northern 
Appalachians into Northern New England on Sunday into Monday. A fair amount of lake effect snow 
will develop over the southeastern coast of Lake Erie also on Sunday into Monday.  The snow will 
wane over the area by Monday afternoon.  

Over the Pacific Northwest on Sunday, one front after another will move onshore produce heavy 
precipitation over the area on Sunday into Thursday.  The associated plumes of moisture will have 
higher moisture content with an atmospheric river moving into the Northwest Coast by Thursday.  

In addition, the heavy rain that has been depicted over the Southern Plains/Lower Mississippi 
Valley on the hazards chart the last few days has a lot more uncertainty in the models depiction of 
the heavy rain over the area that is associated with the low pressure moving across the Gulf Coast. 
 With the uncertainty of the exact location of the heavy rain the location was left off the chart. 

In Alaska, much below normal temperatures are likely through much of the period 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.  

Ziegenfelder