U.S. Severe Weather Forecast (Convective Outlook)

Day Three

acus03 kwns 140751 
Storm Prediction Center ac 140750 

Day 3 convective outlook 
National Weather Service Storm Prediction Center Norman OK 
0150 am CST Fri Dec 14 2018 

Valid 161200z - 171200z 

..no severe thunderstorm areas forecast... 

some thunder potential will be noted during the first half of the 
period across portions of the northeast. Isolated thunderstorms may 
also be noted along the Pacific coast during the latter half of the 


Strong upper low is forecast to eject across the Delmarva Sunday in 
response to a strong mid-level jet that will dig southeast into the 
northern Great Lakes by the end of the period. Focused low-level 
warm advection along the cool side of ejecting surface low should 
encourage at least weak elevated convection from portions of PA, 
east. Strongest convection may attain levels supportive of 
generating a few lightning strikes. 

..Pacific coast... 

Multifaceted upper trough will approach the Pacific coast after 
midnight Sunday night. Much cooler mid-level temperatures will 
spread inland as a surface front surges across western WA/OR. 
Post-frontal onshore flow and cooling profiles may support isolated 
lightning within the strongest convection. Southern extent of 
thunder threat may extend along the central California coast as heights are 
expected to lower across this region as a secondary short wave 
shifts into California late. 

.Darrow.. 12/14/2018