Notice the convection aroun dthe Keyes and points further south being 'pushed' north with what seems to be part of this storms environment or a weakness to the ridge or a combo of the two.
Meaning the outflow is pushing convecrtion north and there is not enough ridge to block that stray convection or divert it.
I am probably way off so bare with me!
Still in kindergarten here with regards to my weather schoolage :