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Pacific ENSO Update

3rd Quarter, 2009 Vol. 15 No. 3


TROPICAL CYCLONE SUMMARY FOR 1st HALF 2009

Tropical cyclone activity in the western North Pacific basin had a late start this year. There were no named cyclones until May 3, when the tropical depression that became typhoon Kujira was given its name by the JMA. Through July 20, the JTWC numbered 7 tropical cyclones in the western North Pacific basin. This was near normal. Of these 7 cyclones, 4 were typhoons, 2 were tropical storms, and one of them (TC 06W) intensified only to the depression stage, and was not named by the JMA. A westward shift is still noted in the tropical cyclone activity, which is one of the several ways in which the tropical Pacific atmosphere continues to exhibit characteristics not typically noted during the onset of El Niño.


The PEAC Center archives western North Pacific tropical cyclone numbers, track coordinates, and 1 minute average maximum sustained wind taken from operational warnings issued by the Joint Typhoon Warning Center (JTWC) of the U. S. Air Force and Navy, located at Pearl Harbor, Hawaii. Western North Pacific tropical cyclone names are obtained from warnings issued by the Japan Meteorology Agency (JMA), which is the World Meteorological Organization's Regional Specialized Meteorological Center (RSMC) for the western North Pacific basin. The PEAC Center archives South Pacific tropical cyclone names, track coordinates, central pressure, and 10 minute average maximum sustained wind estimates from advisories issued by the Tropical Cyclone Warning Centers at Brisbane, Nadi, and Wellington. The numbering scheme and the 1-minute average maximum sustained wind estimates are taken from warnings issued by the JTWC. There are sometimes differences in the statistics (e.g., storm maximum intensity) for a given tropical cyclone among the agencies that are noted in this summary, but the JTWC values are given precendence when available.



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Page Last Modified: June 01 2010 22:10:34 GMT

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