A frontal passage tomorrow will trigger some strong storms sometime during the afternoon, and based upon the above graphical depiction of the available mixed layer CAPE (instability) and a quick review of forecast wind profiles I agree with the SPC that Northern and Central Virginia may see a few supercells tomorrow.  The upper level trough that is pushing the surface front through will actually sag a bit further southward than recent systems have, providing more upper level wind support to strengthen storms than we’ve seen for a few weeks. 
Unfortunately this frontal passage won’t lead to cool conditions, just less hot than we’re seeing today.   The National Weather Service forecast for Fredericksburg shows the coolest high temperature for next week to be 90 degrees.  But a chase is a chase is a chase!