US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
344 PM EST Thu Jan 10 2019
 
Valid Sunday January 13 2019 - Thursday January 17 2019
 
Hazards:
Heavy precipitation across portions of the Central Great Basin and California, Mon-Thu, Jan 14-Jan 
17.
Heavy rain across portions of California, Sun-Mon, Jan 13-Jan 14.
Heavy rain across portions of California, Mon-Thu, Jan 14-Jan 17.
Heavy snow across portions of the Central Great Basin, California, and the Southwest, Mon-Thu, Jan 
14-Jan 17.
Heavy snow across portions of the Southern Appalachians, the Mid-Atlantic, and the Central 
Appalachians, Sun, Jan 13.
Flooding occurring or imminent across portions of the Lower Mississippi Valley, the Middle 
Mississippi Valley, the Mid-Atlantic, the Southeast, the Southern Plains, and the Ohio Valley.
High winds across portions of California, Sun, Jan 13.
 and Tue-Wed, Jan 15-Jan 16.
Heavy precipitation across portions of mainland Alaska, Sun-Wed, Jan 13-Jan 16.
High winds across portions of mainland Alaska and the Aleutians, Sun-Tue, Jan 13-Jan 15.
High winds across portions of the Aleutians, Tue-Wed, Jan 15-Jan 16.
High significant wave heights for coastal portions of mainland Alaska, Sun-Mon, Jan 13-Jan 14.
 
Detailed Summary:

A storm over the Southeast will move off the Mid-Atlantic by Sunday evening.  The system will 
produce heavy snow over parts of the Mid-Atlantic on Sunday morning.  There is some uncertainty 
with the ECMWF going a little farther south than the GFS.  

Deep low over the Aleutians will move Northwestward into the Bering Sea while weakening.  A long 
fetch over the Pacific will steer a plume of moisture into parts of the Alaska Coast from Sunday 
into Wednesday.  The system will produce heavy precipitation  near the Kodiak Island with rain at 
lower elevations and snow at higher elevations.  The storm will also produce high wind over the 
Aleutians and Wade Hampton/Nome from Sunday into Wednesday due to the tight pressure gradient 
associated with the storm.  A long with the high wind, significant waves will be associated with 
the storm.  The waves will be over 20 feet. 

Another storm over the Eastern Pacific will move towards the West Coast on Sunday into Monday then 
retreat to the Northwest over the Eastern Pacific on Wednesday into Thursday.  The pressure 
gradient associated with the low will produce high wind over the coast of Northern/Central 
California on Sunday and again on Tuesday into Wednesday.  A plume of moisture over the Eastern 
Pacific will move into California on Tuesday into Thursday.  The storm will produce heavy rain and 
higher elevation heavy snow over California on Sunday into Thursday.  


Ziegenfelder