After developing into a tropical storm on Thursday, Erin quickly weakened to a tropical depression on Friday as environmental conditions became unfavorable for further development, the National Hurricane Center (NHC) reported.
The center of Tropical Depression Erin was located 625 miles west northwest of the Cape Verde Islands with maximum sustained winds of 35 mph. It was moving toward the west-northwest near 17 mph as of NHC's latest advisory at 5 p.m. EDT Friday.
"The observed weakening is likely the result of cool sea surface temperatures and stable air," said John Cangialosi, a hurricane specialist at the NHC.
While Erin is expected to move over warmer waters, increasing west-southwesterly shear is expected to maintain an overall unfavorable environment for development over the next several days.
Erin is eventually forecast to recurve out in the open Atlantic and pose no threat to land.
Meanwhile, a possible storm is still being monitored in the southwestern Gulf of Mexico, just over 100 miles north-northwest of Campeche, Mexico.
The NHC said environmental conditions could become more favorable for development if the low moves toward the west or west-northwest over the next couple of days. This system was given a medium chance or 50 percent chance of becoming a tropical depression or storm over the next five days.
All interests in the central and western Gulf of Mexico are advised to monitor the progress of this system through the weekend.
The hurricane season is now in a period of increased tropical activity, which typically begins in mid-August. The peak of the season occurs around Sept. 10.