 Due to favorable conditions such as low wind shear and warm sea surface temperatures, the depression strengthened into a tropical storm and was named "Gladys" by the National Hurricane Center (NHC) on September 24.After becoming a tropical storm, Gladys slowly intensified as winds increased to 50 mph (80 km/h).The storm then moved west-northwest, and on September 25, Gladys strengthened into a Category 1 hurricane on the Saffir–Simpson hurricane wind scale (SSHWS).