We leave Wednesday and saw the same thing. But, we go in May all the time and sometimes it materializes, and sometimes not. When it does, it's often brief anyways and moves along. The storms are so localized that it's really not much.
I also saw that they actual amounts of rain are .1-.6 of an inch, so that really is a storm and then moving on, and rarely a whole day of rain.
Either way...pack a raincoat/umbrella/poncho and all will be good.