US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
353 PM EST Tue Dec 11 2018
 
Valid Friday December 14 2018 - Tuesday December 18 2018
 
Hazards:
Heavy precipitation across portions of the Pacific Northwest and the Northern Great Basin, Sun-Tue, 
Dec 16-Dec 18.
Heavy precipitation across portions of California, the Central Great Basin, and the Pacific 
Northwest, Sun-Mon, Dec 16-Dec 17.
Heavy rain across portions of the Northeast, the Central Appalachians, the Mid-Atlantic, the 
Southern Appalachians, the Southeast, the Great Lakes, and the Ohio Valley, Fri-Sat, Dec 14-Dec 15.
Flooding possible across portions of the Southeast.
Flooding occurring or imminent across portions of the Southeast, the Mid-Atlantic, and the Southern 
Plains.
Flooding likely across portions of the Southeast.
High winds across portions of the Central Rockies, the Central Plains, the Northern Plains, and the 
Northern Rockies, Tue, Dec 18.
Much above normal temperatures across portions of the Upper Mississippi Valley and the Northern 
Plains, Fri-Tue, Dec 14-Dec 18.
High significant wave heights for coastal portions of California and the Pacific Northwest, 
Sun-Mon, Dec 16-Dec 17.
High winds across portions of mainland Alaska and the Aleutians, Mon-Tue, Dec 17-Dec 18.
High winds across portions of the Alaska Panhandle, Sat-Sun, Dec 15-Dec 16.
High significant wave heights for coastal portions of the Alaska Panhandle and mainland Alaska, 
Sat-Sun, Dec 15-Dec 16.
 
Detailed Summary:

Alaska has a general upper level low and a couple of probably strong surface lows leading to 
hazards and potentially much below normal temps that I didn't put in because their threshold for 
anomalies is higher 

West will have rounds of precip and hazards because of two upper-level troughs coming in. Surf's up 
dude

Northern Plains and Mississippi Valley will be much above average temperature-wise because there's 
general ridging I guess, but it depends on which model you look at. There is snow cover and there 
will be highs above freezing and lows below freezing so there could be issues with refreezing on 
roads and stuff. Winds in Rockies/High Plains bc of strong pressure gradient. Could be some winds 
earlier in the period but looks like the better chance is next Tues. 

In the East, heavy rainfall will be likely this weekend due to a surface low tracking through the 
Southeast and/or the Carolinas. There is uncertainty regarding the placement of the surface low. It 
is likely that the precipitation will be all rain through the Southeast and Mid-Atlantic, but some 
snow and mixed precipitation is possible in the Northeast for the end of the week.