Okay, chances are I have no clue what I am talking about and that I am wrong about this since I am a total noob at making my own forecasts, but when looking at GOES 16 imagery and the surface analysis this is what I interpreted. 

Basically, there is an an area of slight wind shear along and just east of the boundary between the moist air stream from the Pacific and a dry slot that I think might provide just enough instability to create a band of isolated CBs ahead of the boundary embedded in tonight's rainfall leading to "a few rumbles of thunder" in parts of the area during the rain event. 
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