Miami - A tropical depression that formed in the Florida Straits was moving into the southeastern Gulf of Mexico early on Monday and the US National Hurricane Center said it could soon become a tropical storm.
The depression's maximum sustained winds were near 55km/h with some strengthening expected during the next two days. Forecasters said it could become a tropical storm later in the day or overnight.
As of 05:00 EDT, the depression was centred about 245km west-southwest of Key West, Florida, and was moving west near 15km/h.
The depression was expected to bring 35 to 60mm of rain over the southern Florida peninsula and the Florida Keys through Wednesday that could cause flooding and flash flooding.
Meanwhile, another tropical depression that formed west of Bermuda was moving toward the coast of North Carolina. That depression is expected to become a tropical storm overnight and threatens to bring wind and rain to eastern North Carolina. It's maximum sustained winds Monday morning were near 55km/h with slow strengthening forecast during the next two days.
The depression was centred about 340km southeast of Cape Hatteras, North Carolina, and was moving west-northwest near 15km/h.
A tropical storm watch was in effect for North Carolina's coast from Cape Lookout to Oregon Inlet.
Farther east, Hurricane Gaston has weakened a little as it drifted northward in the middle of the Atlantic.