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Since 2009 the Hong Kong Observatory has divided typhoons into three different classifications: typhoon, severe typhoon and super typhoon. [20] A typhoon has wind speed of 64–79 knots (73–91 mph; 118–149 km/h), a severe typhoon has winds of at least 80 knots (92 mph; 150 km/h), and a super typhoon has winds of at least 100 knots (120 mph ...
The West Pacific is the most active and the north Indian the least active. An average of 86 tropical cyclones of tropical storm intensity form annually worldwide, with 47 reaching hurricane/typhoon strength, and 20 becoming intense tropical cyclones, super typhoons, or major hurricanes (at least of Category 3 intensity). [1]
In August 2006, Typhoon Saomai became the strongest typhoon on record to strike China, with a central pressure of 920 mbar (27 inHg) and winds of 215 km/h (134 mph) at its landfall in Zhejiang. It produced wind gusts of 293 km/h (182 mph) in Wenzhou. The typhoon killed 456 people and left more than US$4.2 billion in damage. [131]
In the Atlantic and Eastern Pacific oceans, the word “hurricane” is used, the Western North Pacific calling the system’s “typhoons,” and the western South Pacific and Indian oceans deem ...
September 1939: Two tropical systems entered the state during the month. On September 4, the remnants of a former hurricane entered southwest Arizona, near Yuma. More than 5.00 inches (127 mm) of precipitation fell in northwest Arizona, with many parts of the state collecting more than an inch of rain. [6]
While many of these storms form in the Atlantic basin, some systems or their remnants move through Mexico from the Eastern Pacific basin. The average storm total rainfall for a tropical cyclone impacting the lower 48 from the Atlantic basin is about 16 inches (410 mm), with 70–75 percent of the storm total falling within a 24-hour period.
One of this year’s most powerful storms made landfall in northern Vietnam on Saturday, after killing at least four people and injuring at least 95 others in southern China, according to state media.
Tropical cyclones are known to form even when normal conditions are not met. For example, cooler air temperatures at a higher altitude (e.g., at the 500 hPa level, or 5.9 km) can lead to tropical cyclogenesis at lower water temperatures, as a certain lapse rate is required to force the atmosphere to be unstable enough for convection.