A stronger sun angle combined with an unstable atmosphere aloft will result in isolated to scattered thunderstorms in our region Sat-Sun (May 5th-6th).
Klamath Falls is currently right on the line for the weekend. Based on the latest forecast information they put out looks like most of the storms will be in the mountains from the Crater Lake area north. This could change though, so just be aware we are dealing with an unstable (read: somewhat unpredictable) mass of air this weekend.
From the NWS Medford:
Outdoor plans this weekend? Thunderstorms are expected Saturday afternoon through Sunday evening. Be sure to have a plan on where to go should a storm develop nearby. Remember, “When thunder roars, go indoors!”