This warmth feeds Atlantic hurricanes and helps in giving them strength. Climate change that's warming waters further is also making them larger, as in increased intensity and amount of water. Hurricanes are common along the Gulf Coast, such as Katrina in 2005, Ike in 2008, Harvey in 2016, and Michael in 2018. Obviously the Gulf of Mexico is not always calm as shown in this photo which I see as a picture of pure serenity.
The Gulf of Mexico has a warm current with surface temperatures that normally are also warm and calm.