U.S. Severe Weather Forecast (Convective Outlook)

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Storm Prediction Center ac 090637 


Day 3 convective outlook 
National Weather Service Storm Prediction Center Norman OK 
1237 am CST sun Dec 09 2018 


Valid 111200z - 121200z 


..no severe thunderstorm areas forecast... 


... 
the risk for severe thunderstorms appears negligible across the U.S. 
Tuesday through Tuesday night. 


... 
Models indicate that a strong, largely zonal mid/upper jet, 
extending across much of the mid-latitude Pacific at the beginning 
of the period, may undergo increasing amplification Tuesday through 
Tuesday night. As this occurs, one significant short wave impulse 
emerging from it is forecast to gradually dig inland of the British 
Columbia/Pacific northwest coast. 


Preceded by low-level warming and an influx of moisture ahead of an 
associated cold front early Tuesday, strong mid-level cooling 
Tuesday night (including 500 mb temps to around or below -30c) 
probably will be accompanied by sufficient destabilization to 
support a few thunderstorms near Washington and Oregon coastal 
areas. Aided by modest Post-frontal onshore flow, some of this 
activity could develop into the western slopes of the Cascades, but 
the risk for severe weather appears negligible. 


Elsewhere, generally dry and/or stable conditions are expected to 
persist across the remainder of the U.S., With negligible risk for 
thunderstorms. 


.Kerr.. 12/09/2018 


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