A storm system brewing off the east coast of Mexico now has a 70% chance of forming into a tropical cyclone in the next 48 hours, the National Hurricane Center said on June 28, an increase from previous forecasts.

When Tropical Storm Andrea made its 12-hour appearance in the middle of the northern Atlantic Ocean earlier this week, it ended the longest wait for a named storm in the basin since the 2014 season. It developed in open waters west of the Azores and hundreds of miles east of Bermuda.

An area of stormy weather in the open Atlantic Ocean became Tropical Storm Andrea on Tuesday morning, the first of the Atlantic hurricane season, according to the National Hurricane Center.