A new Atlantic tropical storm forms off coast of Africa

Tropical Storm Fred has formed off the coast of Africa with 40 mph winds.

A tropical storm warning and hurricane watch are in effect for the Cape Verde Islands.

At 11 a.m. Sunday, Fred was moving northwest at about 12 mph, a path expected to continue through Tuesday. Maximum sustained winds were 50 mph.

Strengthening is expected in the next 48 hours, according to the National Hurricane Center.

This story was originally published August 30, 2015 at 8:51 AM with the headline "A new Atlantic tropical storm forms off coast of Africa."