A subtropical storm — in essence a hybrid between a tropical and a nontropical storm — has formed near the Azores, prompting warnings for the entire Portuguese archipelago. The 16th tropical or subtropical storm to form in the Atlantic basin during the 2024 hurricane season has been named Patty.

With less than one month left in hurricane season, the National Hurricane Center said Saturday that Subtropical Storm Patty has formed over the northern Atlantic. NHC is also tracking two storms in the Caribbean, one that has a high chance of development.

National Hurricane Center forecasters say there's a 80% chance that a system develops over the southwestern Caribbean Sea over the next seven days.