a cyclone is an area of closed or system of winds that rotates about a center of low atmospheric pressure, advances at a speed of 20 to 30 miles (about 30 to 50 kilometers) an hour, and often brings heavy rain
Tropical cyclones form over warm areas of the Atlantic, Pacific, and Indian oceans. They usually develop in the summer or fall. Hurricane and typhoon season is from June to November. In the Southern Hemisphere, most cyclones form between December and April.