Cyclone Aila November 8, 2009

Cyclone Aila (RSMC Designation: BOB02, JTWC Designation: 02B, also known as Severe Cyclonic Storm Aila) was the second tropical cyclone to form within the Northern Indian Ocean during 2009. The disturbance that was to become Cyclone Aila formed on 21 May 2009 about 950 kilometres (590 mi) to the south of Kolkata, in India. Over the next couple of days the disturbance slowly developed before a Tropical Cyclone Formation Alert was issued by the Joint Typhoon Warning Center early on 23 May 2009 and being designated as a depression by RSMC New Delhi. As of 27 May 2009, 330 people have been killed by Aila and at least 8,208 more are missing, while about 1 million are homeless. Health officials in Bangladesh confirmed a deadly outbreak of diarrhea on 29 May, with more than 7,000 people being infected and four dying. In Bangladesh, an estimated 20 million people were at risk of post-disaster diseases due to Aila. Damage totaled $40.7 million (USD).

Environmental impact

The Sunderbans, a region which houses 265 of the endangered Bengal Tigers, was inundated with 6.1 m (20 ft) of water. Dozens of the tigers are feared to have drowned in Aila’s storm surge along with deers and crocodiles. As of 27 May 2009, one tiger has been found alive; it was found in a waterlogged cowshed following the cyclone’s landfall. Additionally the forest remains under an estimated 2.4 m (7.9 ft) of water. On 27 May, conservationists have begun a search for the tigers throughout the forest. The search teams were supplied with fresh drinking water for the tigers as their natural water source was inundated with salt water from Aila’s storm surge.

Tropical cyclone From Wikipedia, the free encyclopedia October 30, 2009

A tropical cyclone is a storm system characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rain. Tropical cyclones feed on heat released when moist air rises, resulting in condensation of water vapor contained in the moist air. They are fueled by a different heat mechanism than other cyclonic windstorms such as nor’easters, European windstorms, and polar lows, leading to their classification as “warm core” storm systems. Tropical cyclones originate in the doldrums near the equator, about 10° away from it

Tropical Cyclone Programme

There are six such meteorological centres and five regional Tropical Cyclone Warning Centres utilized for naming of tropical cyclones and the distribution of tropical cycloneadvisories and warnings:

• Southwest Pacific Ocean: RSMC Nadi-Tropical Cyclone Centre – Fiji Meteorological Service (Nadi, Fiji)
• Southwest Indian Ocean: RSMC La Reunion-Tropical Cyclone Centre / Météo France (Réunion island, French Overseas Department)
• Bay of Bengal and Arabian Sea: RSMC – Tropical Cyclones New Delhi / India Meteorological Department (New Delhi, India)
• Western North Pacific Ocean and South China Sea – RSMC Tokyo / Japan Meteorological Agency (Tokyo, Japan)
• Central North Pacific Ocean – RSMC Honolulu Central Pacific Hurricane Center (Honolulu, Hawaii, USA)
• Northeast Pacific Ocean, Gulf of Mexico, Caribbean Sea, and north Atlantic Ocean – RSMC Miami / National Hurricane Center^[1]

Eye (cyclone)

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The eye is a region of mostly calm weather found at the center of strong tropical cyclones. The eye of a storm is a roughly circular area and typically 30–65 km (20–40 miles) indiameter. It is surrounded by the eyewall, a ring of towering thunderstorms where the most severe weather of a cyclone occurs. The cyclone’s lowest barometric pressure occurs in the eye, and can be as much as 15% lower than the atmospheric pressure outside the storm.^[1]

In strong tropical cyclones, the eye is characterized by light winds and clear skies, surrounded on all sides by a towering, symmetric eyewall. In weaker tropical cyclones, the eye is less well-defined, and can be covered by the central dense overcast, which is an area of high, thick clouds which show up brightly on satellite imagery. Weaker or disorganized storms may also feature an eyewall which does not completely encircle the eye, or have an eye which features heavy rain. In all storms, however, the eye is the location of the storm’s minimum barometric pressure: the area where the atmospheric pressure at sea level is the lowest