I saw a tree in bloom over Mother's Day weekend.
The tree that you are referring to is Paulownia tomentosa or (Empress Tree, Royal Paulownia). It is exceedingly adaptable, has large leaves, spreads easily, is pretty in bloom but not recommended for residential properties. If it isn't this tree, it is wisteria vine that has escaped from cultivation. Jacaranda trees are tropical and do not survive the winters in Pennsylvania.