Helene is strengthening as it moves toward the U.S. Gulf Coast. It is expected to become a hurricane today and will hit Florida's Big Bend on Thursday.

Hurricane Helene is forecast to bring dangerous storm surge to the Tampa Bay area. "The residence halls will be closed after the evacuation concludes, and there will be no entry allowed into residential buildings until they are reopened following the storm," the university said in a message to students.

There is no modern reference point for Helene. This will very likely be the worst hurricane impact in living memory.