(Bloomberg) -- When the Atlantic hurricane season starts next week, the most active area might just be off the U.S. East Coast.

At this time of year, passing cold fronts that linger over waters warmed by the late spring sun can trigger tropical storms there or off the Gulf of Mexico or western Caribbean, said Jeff Masters, co-founder of Weather Underground in Ann Arbor, Michigan. An area of thunderstorms and a weakening cold front have a 50% chance of becoming a tropical or sub-tropical system in the next five days, the National Hurricane Center said Wednesday.

“Since these storms form close to land, they typically do not spend enough time over water to become major, land-falling hurricanes,” Masters said.

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