Keywords: Hurricane-profile-en.svg Tropical cyclones form when the energy released by the condensation of moisture in rising air causes a positive feedback loop over warm ocean waters http //earthobservatory nasa gov/Library/Hurricanes/Images/hurricane_section gif 2007-03-31 Robert Simmon NASA GSFC Nichalp http //commons wikimedia org/wiki/Image Hurricane-profile-blank svg Inkscape PD-USGov-NASA Nichalp March 2007 Original upload log en wikipedia Hurricane-profile-en svg wikitable - 2007-03-31 14 19 1000×500× 37244 bytes Nichalp <nowiki> Tropical cyclones form when the energy released by the condensation of moisture in rising air causes a positive feedback loop over warm ocean waters http //earthobservatory nasa gov/Library/Hurricanes/Images/hurricane_s</nowiki> Structure of tropical cyclones |