No. Although Irene is a very large hurricane it is by no means the biggest.

Hurricane Sandy was a Category 3 hurricane before making landfall. When Sandy made landfall in New Jersey, the intensity was similar to a Category 1.

No. A hurricane on water is simply a hurricane. Tsunami is a large wave triggered by an underwater disturbance such as an earthquake. A hurricane is a type of storm.

Hurricane

Meteorologists get the image of a hurricane from satellite photos. By putting several hours of satellite pictures into motion, they can gather information on the track and development of the tropical cyclone.