have been done. while its clear the hackers breached multiple systems, we don't know, scott, what they took. >> pelley: bob orr, in our washington newsroom tonight. bob, thanks very much. severe weather is pounding the south for a second night. tornado watches are up in several states after at least 14 twisters touched down yesterday. alabama got hit overnight. in decatur, high winds knocked down a roof at a used car lot and a huge oak tree crashed into a house in tuscumbia. two people inside suffered minor injuries. a new study out today says the san francisco bay area is due for a strong earthquake with a possible magnitude of 6.8 or greater. the study's coauthor says pressure has been building for years along sections of the san andreas fault system but, of course, there is no way to tell exactly when this big one might hit. the u.s. and its allies have unleashed their most intense barrage to date against the islamic terrorist group known as isis. there have been 21 airstrikes 24 hours near the kurdish village