MIAMI (Reuters) – The U.S. weather agency NOAA predicted a slightly more active 2012 Atlantic hurricane season on Thursday, saying warming seas and the late arrival of El Nino would bring near-normal to above-normal storm activity.

Forecasters expect the June-through-November season will bring 12 to 17 tropical storms, with five to eight of those becoming hurricanes and two to three strengthening into major hurricanes.

That was a slight increase from the May forecast, when the agency predicted there would be nine to 15 tropical storms, with four to eight becoming hurricanes and one to three strengthening into major hurricanes. Major hurricanes have sustained winds of 111 miles per hour (178 km per hour) or higher and can cause devastating damage.

An average year brings about 12 tropical storms with six hurricanes and three major hurricanes.

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