US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
240 PM EST Mon Dec 30 2019
 
Valid Thursday January 02 2020 - Monday January 06 2020
 
Hazards:
- Heavy precipitation across portions of the Pacific Northwest, Thu-Sun, Jan 2-Jan 5.
- Heavy precipitation across portions of central Idaho into western Montana, Sun, Jan 5.
- Heavy rain from across the lower Mississippi Valley into the Tennessee Valley, the Southern 
Appalachians, into the interior Southeast as well as the interior Mid-Atlantic, Thu-Fri, Jan 2-Jan 
3.
- Flooding possible across portions of the Mid- and upper Mississippi Valley, the Great Lakes, and 
into the Ohio Valley.
- Flooding occurring or imminent across portions of the Mid-Mississippi Valley and the northern 
Plains.
- Flooding likely across portions of the central Plains and the Mid-Mississippi Valley.
 
Detailed Summary:

A vigorous upper-level vortex emerging from northern Mexico will draw moisture northward from the 
Gulf of Mexico, bringing a good chance of heavy rain from the central to eastern Gulf Coast 
northeastward through the interior Mid-Atlantic Thursday and Friday.  By Saturday, the rain is 
expected to spread rapidly up the East Coast and then become less intense across the northern 
Mid-Atlantic into New England as the main energy of the system moves off the coast.  Some wintry 
precipitation can be expected from the Great Lakes to the interior sections of the Northeast with 
the passage of the system.  Following the departure of the low, multiple weak disturbances are 
forecast to move across the Great Lakes into the Northeast.  This will keep a good chance of wintry 
weather across the area through early next week.

The Pacific Northwest will continue to see periods of mountain snow and coastal rain through the 
medium-range period.  Some of the moisture will penetrate downstream across the northern to central 
Rockies.  The higher elevations of central Idaho into western Montana should get the best chance of 
snow on Sunday when the snow could be heavy.

Over in Alaska, it appears that the synoptic pattern will become less active during the 
medium-range as the main jet stream shifts southeast of the area.  Thus, no hazard areas are 
indicated through the medium-range.

Kong