(St. Petersburg, Fla.) (AP) — Subtropical Storm Alberto re-energized and re-organized as it churned toward the Panhandle and increased the risk of flooding and thunderstorms in some parts of South Florida. The center of Subtropical Storm Alberto will likely reach the northern U.S. Gulf Coast Monday afternoon or evening.

The National Hurricane Center in Miami said in an advisory issued at 8 a.m. EDT that the storm’s center was located about 100 miles (165 kilometers) south-southeast of Destin, Florida, and moving north at 6 mph (9 kph).

Maximum sustained winds were clocked at 65 mph (100 kph).

A tropical storm warning remains in effect for an area stretching from Florida’s Suwannee River to the border of Alabama and Mississippi.

A storm surge watch remains in effect for much of northern Florida, from the Suwannee to Navarre in the Panhandle. A storm surge watch means life-threatening inundations are possible from rising water moving inland from the coast. Destin and Panama City Beach are within the watch area.