Today’s economic data–like many other days in the history of financial markets–COULD certainly matter. Whether or not it does, depends on where it falls.
Typically, we shouldn’t expect Jobless Claims to be a substantial market mover. It can have a noticeable impact fairly regularly, but that impact is a shadow of its former self (back when employment data was still in a state of flux as opposed to leveling-off with a sort of half-hearted strength).