Tropical cyclones Portal
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.
The term "tropical" refers to both the geographic origin of these systems, which form almost exclusively in tropical regions of the globe, and their formation in maritime tropical air masses. The term "cyclone" refers to such storms' cyclonic nature, with counterclockwise rotation in the Northern Hemisphere and clockwise rotation in the Southern Hemisphere. Depending on its location and strength, a tropical cyclone is referred to by names such as hurricane, typhoon, tropical storm, cyclonic storm, tropical depression, and simply cyclone.
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The 1970 Bhola cyclone was a devastating tropical cyclone that struck East Pakistan (now Bangladesh) on November 12, 1970. It was the deadliest tropical cyclone ever recorded, and one of the deadliest natural disasters of modern times. Up to 500,000 people lost their lives in the storm, mostly as a result of the storm surge that flooded many of the low-lying islands of the Ganges Delta. This cyclone was the sixth cyclonic storm of the 1970 North Indian Ocean cyclone season and was also the most powerful, reaching a strength equivalent to a Category 3 hurricane.
The cyclone formed over the central Bay of Bengal on November 8 and moved north, intensifying as it did so. It reached its peak with winds of 185 km/h (115 mph) on November 12 and made landfall on the East Pakistan coast that night. The storm surge devastated many of the offshore islands, wiping out villages and destroying crops throughout the region. In the most severely affected Thana, Tazumuddin, over 45% of the population of 167,000 was killed by the storm.
The Pakistani government was severely criticised for its handling of the relief operations following the storm, both by local political leaders in East Pakistan and in the international media. The opposition Awami League gained a landslide victory in the province and continuing unrest between East Pakistan and the central government trigged the Bangladesh Liberation War, which concluded with the creation of the state of Bangladesh.
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Active tropical cyclones
Tropical cyclone anniversaries
- April 20, 1997 - Typhoon Isa (pictured) reached its peak with winds of 270 km/h (165 mph) to the west of the Mariana Islands. Isa passed to the south of Guam, where it caused beneficial rainfall.
- April 17, 1997 - Cyclone Ian (track pictured) reached its peak with 100 km/h (65 mph) winds, when it was just to the south of Fiji.
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Fri, 11 Apr 2014 09:18:45 -0700
Despite the name, tropical cyclones are not tornadoes — they are the same as hurricanes or typhoons. In the Atlantic and Northeast Pacific, we use the term “hurricane,” while “typhoon” is used in the Northwest Pacific and “cyclone” is used in the ...
Sun, 30 Mar 2014 12:34:19 -0700
Scientists now basically have the ability to x-ray rainstorms and cyclones from space. NASA and the Japanese space agency JAXA just released the first images from the Global Precipitation Measurement (GPM) Core Observatory satellite, which launched on ...
Mon, 31 Mar 2014 05:11:15 -0700
Wed, 16 Apr 2014 17:08:41 -0700
After suffering devastating losses in severe tropical cyclones Yasi and Larry, Mr Piccolo says the industry's fortunes have turned around and now growers can hardly keep up with orders. Jodie Selfton, from FNQ Blooms, doesn't underestimate the ...
Discover Magazine (blog)
Discover Magazine (blog)
Sat, 12 Apr 2014 11:07:56 -0700
Two satellite images of Tropical Cyclone Ita alternate in this animation. Captured by the VIIRS instrument on the Suomi NPP satellite, the images show the storm just before it made landfall on Australia's Queensland coast on April 11, 2014. (Source ...
Wed, 16 Apr 2014 20:33:38 -0700
By studying the two scenarios, the researchers deduced human-made aerosols have greatly impacted the cloud formations and mid-latitude cyclones, or, extra tropical cyclones, which are typically associated with the Pacific storm track that transports ...
Thu, 10 Apr 2014 05:27:37 -0700
“While the strongest winds are focussed near the centre, the warning area for tropical cyclones of this intensity is quite broad with destructive winds, heavy rainfall possibly leading to flash flooding, and coastal inundation due to storm surge all ...
Wed, 16 Apr 2014 18:18:45 -0700
“While warnings will continue to be issued on the Bureau's official warning pages, MetEye can display significant weather such as thunderstorms, tropical cyclones, rainfall, fog and frost. Parliamentary Secretary for the Environment, Senator Simon ...
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