A tropical storm warning is in effect from the Okaloosa-Walton county line in Florida to just east of Morgan City, LA, including Lake Ponchartrain and Lake Maurepas, LA; and Golden Beach to Bonita Beach, FL, including Florida Bay and Ocean Reef.
People in the warned area should prepare for tropical storm conditions - strong wind and heavy rainfall.
A storm surge warning has been issued from Shell Beach, LA, to the Mississippi-Alabama border.
Forecasters have also issued a storm surge watch from west of Shell Beach, LA, to the mouth of the Mississippi River, and from east of the Mississippi-Alabama border to Navarre, FL.
Because Florence is so far away from the mainland, forecasters aren't yet sure what impact it will have on the U.S.
As it encounters shear that will hinder its development, Tropical Storm Florence is expected to make a northwest turn. The timing of that turn is key in determining its impacts, if any, on the U.S. mainland, forecasters said.