Tropical Storm Lorenzo is a strong tropical storm as it moves northwest through the Atlantic. There is no threat to land with Lorenzo.

Hurricane Imelda formed Tuesday, Sept. 30, off the Florida coast. The Category 1 hurricane is expected to strengthen.

The Fujiwhara effect is a semi-rare process that happens when two storms that are relatively close in geography orbit around a shared center point. Sometimes, if the storms are of equal strength, they can spin around each other and then release, going their separate ways. Sometimes they will merge and create a stronger storm.