Hurricanes

Hurricane, Edouard

Hurricane, the word is derived from Spanish word,”Huracan” that is a further derivation of word”Juracan” a god of storm. For a layman every swirling thunderstorm which strikes the land is a hurricane or typhoon as individuals, in the majority of cases come to understand such terms in the information. However, in order to learn the difference, we have to learn few essential concepts of the tropical cyclones. Hurricanes, typhoons, tropical depressions, cyclones and tropic storms are the derivative names for Tropic Cyclones, depending on their strength, size and location. These storms or cyclones are characterized by strong winds, low-pressure facilities and heavy rains.
A hurricane can be differentiated from tropical depression or thunderstorm on the basis of its strength, location and concentration. Whereas, hurricanes and typhoons are moving storm systems with the minimum wind speed of 66 knots or 119 km per hour, which is potentially catastrophic. A cyclone of such intensity develops an eye, an area in the centre of system with lowest atmospheric pressure. Maximum rate of hurricanes has been estimated to around 314 km per hour.
Hurricanes grow usually because of the formation of favorable atmospheric conditions around disturbance in the air. Natural phenomenon such as El-Niño, Madden-Julian oscillation and Atlantic Multi-decadal oscillation modulate the background atmosphere. Tropical systems, once born are moved by fast winds in troposphere under favorable conditions. As the systems move it tends to develop an eye. But if the atmospheric conditions do not allow, the system becomes weak and dissipates. Presently, technology has not been advanced enough to induce dissipation of these storms or a hurricane.
Atmospheric pressure recorded in the center of the eye is lowest happening on sea level surface of the planet. Condensed latent heat, when released in massive amounts, drives the hurricanes and it happens when moist air lifts up condensing its water vapors. The stated heat distributes around the storm’s center in a vertical order. For this reason, temperatures inside the hurricanes are usually warmer than the surrounding region.
The eye of a hurricane shouldn’t be taken in literal meanings. It’s usually 30 to 120 km in diameters, though smaller hurricanes carry as small as an eye in diameter of 3 km and as large as 360 km. The environment within the eye is generally calm and mild compared to its surrounding fast moving winds. As they get their energy from warmer oceanic waters, they tend to lose energy when they move on land as they also face greater surface friction along with the lack of warmer water. For the same reason, hurricanes leave more harm to coastal or tropic regions than inland areas. Hurricanes can be lethal at coastal regions going as deep at 1000 kms, whereas it may also cause flooding up to 40 kms from shore. Size of a hurricane can be classified into three major categories. Hurricanes ranging under 222 kms in radius are termed as”very small”, those ranging from 333 to 670 km in radius are termed as”Average” and those greater in radius than 888 kms are classified as”Very big” hurricanes.
A difference between a typhoon and hurricane ought to be understood to avoid confusion. Severe tropic cyclones, when born in Northwestern Pacific and obtains high intensity wind speed, it’s called a typhoon. On the other hand, a tropic cyclone which takes birth in Northeast Pacific basin or Atlantic Ocean is called a hurricane. Storms arising from the Southern hemisphere and Indian Oceans are simply known as the Cyclones.
“Bhola Cyclone” at the coasts of Bangladesh in 1970 has been listed as the deadliest one in recorded history in which nearly 0.3 million lost their lives. Typhoon Tip which originated in 1979 in Pacific Ocean has been the most intense hurricane having the pressure of 870 mbar and wind speeds of 310 km/ hour. Hurricane John holds the record of longest lasting hurricane, which lasted for a complete month in 1994 from the northern hemisphere.

Leave a Reply

Your email address will not be published. Required fields are marked *