Hanna+ML-Hurricane+Formation

What is a Hurricane?

 * Severe tropical storms that rotate in a counter-clockwise direction around an "eye."
 * Wind speeds range from 74 mph. to more than 155 mph.
 * The most dangerous parts of hurricanes are storm surges (large waves created by hurricane winds)
 * Hurricanes are categorized by the saffir-simpson and beaufort scale hurricane scale.

[|IMD] ||~ SW Indian Ocean [|MF] ||~ Australia [|BOM] ||~ SW Pacific [|FMS] ||~ NW Pacific [|JMA] ||~ NW Pacific [|JTWC] ||~ NE Pacific & N Atlantic [|NHC] & [|CPHC] || 
 * ~ **Tropical Cyclone Classifications (all winds are 10-minute averages)** ||
 * ~ [|Beaufort scale] ||~ 10-minute sustained winds (knots) ||~ N Indian Ocean
 * 0–6 || <28 || Depression || Trop. Disturbance || Tropical Low || Tropical Depression || Tropical Depression || Tropical Depression || Tropical Depression ||
 * 7 || 28-29 || Deep Depression || Depression ||
 * 30-33 || Tropical Storm || Tropical Storm ||
 * 8–9 || 34–47 || Cyclonic Storm || Moderate Tropical Storm || Trop. Cyclone (1) || Tropical Cyclone || Tropical Storm ||
 * 10 || 48–55 || Severe Cyclonic Storm || Severe Tropical Storm || Tropical Cyclone (2) || Severe Tropical Storm ||
 * 11 || 56–63 || Typhoon || Hurricane (1) ||
 * 12 || 64–72 || Very Severe Cyclonic Storm || Tropical Cyclone || Severe Tropical Cyclone (3) || Typhoon ||
 * 73–85 || Hurricane (2) ||
 * 86–89 || Severe Tropical Cyclone (4) || Major Hurricane (3) ||
 * 90–99 || Intense Tropical Cyclone ||
 * 100–106 || Major Hurricane (4) ||
 * 107-114 || Severe Tropical Cyclone (5) ||
 * 115–119 || Very Intense Tropical Cyclone || Super Typhoon ||
 * >120 || Super Cyclonic Storm || Major Hurricane (5) ||

How Hurricanes Form
They need these conditions: The low pressure rising makes it possible for new, high pressure to replace it. This causes the formation of the eye and circulation. This is also the start of a hurricanes violent winds that create storm surges. The low Pressure The water emperatures for a hurricane must be at least 80 degrees farenheit to a depth of 50 meters. This and warm temperatures from the sun cause the water to evaporate and to make an unstable atmosphere which creates the actually thunderstorm and convection to kickstart and sustain a hurricane.
 * Low air pressure
 * Warm temperatures

The cool ocean air makes it possible for the warm water vapor to cool quickly. It is necissary for the water vapor to cool at a fast rate becasue this releases the energy, or latent heat of the hurricane. The moist air also helps create an unstable atmosphere to heighten the chances of a more violent disturbance/thunderstorm to start or create more energy for the hurricane.
 * Moist/cool ocean air

The coriolis effect deflects the winds, such as the tradewinds, moving twords the low pressure points. These two winds counteracting eachother creates circulation and movement.
 * Tropical winds (near the equator)



Hurricane Steps to Formation
 * 1) The warm temperatures create water vapor that rises
 * 2) The water vapor cools as it goes higher into the atmosphere and starts to condense
 * 3) This water vapor and condensation makes the air lighter and it continues to rise
 * 4) Meanwhile, warm moist air is moving over the ocean taking the place of the water vapor that has just risen
 * 5) This creates a wind and repeats itself until a cyclonic pattern forms[[image:http://web.mit.edu/12.000/www/m2010/teams/neworleans1/hurricane%20science_files/image004.jpg]]

=Also Review...=
 * Hurricane Lab
 * Hurricane Test
 * Chapter 30/page 556 in Textbook