Physical Structure Of Hurricane


All tropical hurricanes are present at areas of low atmospheric pressure near the Earth's surface. Characterized by the release of large amounts of latent heat of condensation, with movement of moist air upwards and the condensation of water vapor, let us try to understand the physical structure of hurricane.


The size of a hurricane cyclone is established by calculating the distance from its center of circulation to its outermost closed isobar. If the radius is lower than two degrees of latitude or 222 kilometers, then the hurricane is said to be” very small" or a "midget. "average-sized" hurricane is has a radius between 3 and 6 latitude degrees or 333 kilometers. But if the radius is greater than 8 degrees or 888 kilometers, then the hurricane or cyclone is said to be "Very large".


Other techniques of finding the size of  a tropical hurricane is by finding the radius of gale force winds and calculating the radius at which its relative vorticity field reduces to 1×10−5 s−1 from its center. It has been seen that the structure of hurricane in the northwest Pacific Ocean are the largest in size on earth. Read on to know more on hurricane structure.

Composition of hurricane: Eye and center


A strong hurricane cyclone supports an area of dipping air at the center of circulation. If this area is powerful enough, it can build up into a large "eye". The weather in the eye is seen to be normally calm and free of clouds, although the sea around it may be extremely violent. The shape of the eye is circular, ranging in size from 3 kilometers to 370 kilometers. An outward curving of the eyewall's top is seen in powerful, mature hurricanes, thus making it look like a football stadium. As a hurricanes fact, this event as part of the physical structure of hurricane, is thus sometimes known as the stadium effect.


The central dense region of the eye is the area of strong thunderstorm activity concentrating near the center. The eyewall means a circle of strong thunderstorms that surrounding the eye. The heaviest wind damage takes place when a hurricane’s eyewall moves over land. The period of peak intensity in cyclones usually takes place when the radius of maximum winds contract to a very small size, around 10 kilometers, along with an eyewall.