11:32 am - Monday May 28, 2012


A typhoon is a mature tropical cyclone that develops in the northwestern part of the Pacific Ocean between 180° and 100°E. This region is referred to as the northwest Pacific basin. For organizational purposes, the northern Pacific Ocean is divided into three regions: the eastern (North America to 140°W), central (140°W to 180°), and western (180° to 100°E). Identical phenomena in the eastern north Pacific are called hurricanes, with tropical cyclones moving into the western Pacific re-designated as typhoons. The Regional Specialized Meteorological Center (RSMC) for tropical cyclone forecasts is in Japan, with other tropical cyclone warning centers for the northwest Pacific in Honolulu (the Joint Typhoon Warning Center), the Philippines, and Hong Kong. While the RSMC names each system, the main name list itself is coordinated amongst 18 countries, including the United States, who have territories threatened by typhoons each year. The Philippines uses their own naming list for systems which approach the country.

Information of Typhoon

There are six main requirements for tropical cyclogenesis: sufficiently warm sea surface temperatures, atmospheric instability, high humidity in the lower to middle levels of the troposphere, enough Coriolis force to develop a low pressure center, a pre-existing low level focus or disturbance, and low vertical wind shear. While these conditions are necessary for tropical cyclone formation, they do not guarantee that a tropical cyclone will form. Normally, an ocean temperature of 26.5 °C (79.7 °F]) spanning through a depth of at least 50 metres (160 ft) is considered the minimum to maintain the special mesocyclone that is the tropical cyclone. These warm waters are needed to maintain the warm core that fuels tropical systems. A minimum distance of 500 km (300 mi) from the equator is normally needed for tropical cyclogenesis.

Causes of Typhoon

Several atmospheric ingredients must come together for a typhoon to form. Since a typhoon is just another term for hurricane, the same conditions apply for both. There are perhaps seven atmospheric conditions which, if met, could cause a typhoon to form. A pre-existing disturbance, warm ocean water, low atmospheric stability, sufficient Coriolis force, moist mid-atmosphere, and upper atmosphere divergence are all important factors for typhoon formation. These conditions are discussed in greater detail in Tropicalweather.net’s “How do hurricanes form?” These factors are important in that tremendous amounts of heat energy is transported from the tropics northward to the higher latitudes. The typhoon is a large heat engine, where great amounts of heat are being produced from the process of latent heat of condensation. This occurs as water vapor is being evaporated from the ocean surface and condensed into cloud droplets.

Effects of Typhoon

The typhoons are the impacts that typhoons have on the areas they move through. The main destructive impacts include heavy rain, strong wind, large storm surges at landfall, and tornadoes. How devastating a typhoon is depends mainly on its intensity, how big it is, and where it impacts. Typhoons act to remove forest canopy as well as change the landscape near coastal areas, by moving and reshaping sand dunes and causing extensive erosion along the coast. Even well inland, heavy rainfall can lead to mudslides and landslides in mountainous areas. Their impacts can be sensed over time by studying the concentration of the Oxygen-18 isotope within caves near the shore.

After the typhoon has passed, devastation continues. Standing water can cause the spread of disease, and transportation or communications infrastructure may have been destroyed, hampering clean-up and rescue efforts. Nearly two million people have died globally due to typhoons. Despite their devastating effects, typhoons are also beneficial, by potentially bringing rain to dry areas and moving heat from the tropics poleward. Out at sea, ships take advantage of their known characteristics by navigating through their weaker, western half.

Types of Typhoon

1. Tropical Depression
2. Tropical Storm
3. Strong Typhoon
4. Intense Typhoon (Hurricane)
5. Violent Typhoon

Typhoon Videos & Images

Here you can find latest video & images of famous Typhoon.

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