After making it through the month of August with no named systems, Tropical Storm Danielle formed in the central subtropical Atlantic on the first day of September.
Danielle is expected to reach hurricane strength while meandering over open waters.
There are two other areas under watch by the National Hurricane Center.
"Showers and thunderstorms associated with a broad area of low pressure located several hundred miles east of the Leeward Islands have changed little this morning," the NHC said Thursday. "Although environmental conditions remain only marginally conducive, any additional development of the system over the next few days would lead to the formation of a tropical depression. The disturbance is forecast to move slowly west-northwestward, toward the adjacent waters of the northern Leeward Islands."
"Satellite imagery and surface observations show that a broad area of low pressure is located over and to the northwest of the Cabo Verde Islands," said forecasters. "While surface observations indicate pressures are low in this area, the associated shower activity is currently poorly organized. There is still some chance for the system to become a short-lived tropical depression within the next day or so before environmental conditions become unfavorable for further development. Regardless, the system could bring locally heavy rainfall to portions of the Cabo Verde Islands today and tonight."