Watchers at the National Hurricane Center in Miami on Sunday evening were tracking a low pressure area with storms and thunderstorms about 230 miles east of St. Augustine, Florida.
Some computer models show the storm moving northeast along the SC coast by Thursday or Friday, but its far too early for an official forecast.
The Centers latest assessment at 8 p.m. Sunday was that a tropical depression was likely to form by mid-week as the system ambles southward to southwestward off the east-central coast of Florida.
An Air Force Reserve reconnaissance aircraft is scheduled to investigate the disturbance on Monday, if necessary, a Center announcement said.
Tropical depressions can be precursors to hurricanes. But forecasters were careful to say they arent predicting this system will develop into a hurricane.
A tropical depression has minimum sustained winds of 38 mph. A hurricane has maximum sustained winds of 74 mph.