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Tropical cyclones form where heat and moisture from the surface of the ocean interact with a wind pattern that spirals air inward. The water vapor condenses into storm clouds which are further fueled by the heat and wind.

news.nationalgeographic.com/2016/10/hurricanes-facts-storms-weather-science

Oct 6, 2016 ... WATCH: Hurricanes are massive storms with deadly force. Find out how they form, and what's being done to better predict their impact.

www.weatherquestions.com/What_causes_hurricanes.htm

May 29, 2013 ... Brief, simplified description of the causes of hurricanes.

www.thoughtco.com/what-causes-hurricanes-1203855

Mar 29, 2017 ... Rising air and higher water temperatures worldwide are the drivers of more frequent and severe hurricanes.Learn more about how they form.

spaceplace.nasa.gov/hurricanes/en

Hurricanes are the most violent storms on Earth. ... Another way to say the same thing is that the warm air rises, causing an area of lower air pressure below.

www.telegraph.co.uk/science/0/causes-hurricane

Dec 1, 2016 ... Also known as a typhoon or cyclone, a hurricane is created when rising warm water vapour forms a cloud with low pressure beneath, causing ...

www.mhschool.com/socialstudies/2003/hurricanekatrina/hurricaneformation.html

Hurricanes like Katrina are the most powerful storms in nature. ... Storm systems create areas of low pressure, which cause large amounts of water to evaporate.

www.mnn.com/earth-matters/translating-uncle-sam/stories/what-causes-hurricanes

Jul 21, 2010 ... Here's a look at why, where and when hurricanes form, and what you can do to be ready for one.

www.tropicalweather.net/what-causes-hurricanes.html

The causes and effects of hurricane formation. A discussion of the preconditions and mechanisims of hurricane formation.

www.weatherwizkids.com/weather-hurricane.htm

Hurricanes only form over really warm ocean water of 80°F or warmer. ... A hurricane will cause more storm surge in areas where the ocean floor slopes ...