how to hurricanes form?
Hurricanes only form over really warm ocean water of 80°F or warmer near the equator. the warm air rises, causing an area of lower air pressure below. Air from surrounding areas with higher air pressure pushes in to the low pressure area. Then that "new" air becomes warm and moist and rises, too. As the warm air continues to rise, the surrounding air swirls in to take its place. As the warmed, moist air rises and cools off, the water in the air forms clouds. The whole system of clouds and wind spins and grows, fed by the ocean's heat and water evaporating from the surface. Storms that form north of the equator spin counterclockwise. Storms south of the equator spin clockwise. This difference is because of Earth's rotation on its axis.
category winds (mph) storm surge (ft)
category one- 74-95 4-5 ft
category two- 96-110 6-8 ft
category three- 111-130 9-12 ft
category four- 131-155 13-18 ft
category five- more than 155 more than 18 ft
Hurricane Katrina was the eleventh named storm and fifth hurricane of the 2005 Atlantic hurricane season.
Total fatalities: 1,833
Highest winds: 174 mph (280 km/h)
Lowest pressure: 902 mb
Date: August 23, 2005 – August 31, 2005
Category: Category 5 Hurricane
Hurricane Sandy was the deadliest and most destructive hurricane of the 2012 Atlantic hurricane season.
Total fatalities: 285
Highest winds: 115 mph
Lowest pressure: 940 mb
October 22, 2012 – October 31, 2012
Category 3 Hurricane
Impact on Human Life
- hurricanes leave lots of people homeless
- hurricanes kill people
- hurricanes destroy cities
- you have to buy food
- you have to buy generator
- spend money on gas for car or generator
- you have to spend money on repairing yard, house, and roads after hurricanes
- you have to pay big taxes to repair city