Neat example of a day where you'd want to be on the north side of a boundary to see supercells. A well-mixed environment (1) will initiate updrafts that track into northerly flow (2) which will provide shear that rapidly organizes supercells.
Overall, there will be ample energy in the atmosphere (2500-3000 j/kg), very little CIN inhibiting storm development, and considerable amounts of moisture (65-70 degree dew point) all contributing to a fairly good setup.