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Downstream Development Associated with the Extratropical Transition of Tropical Cyclones over the Western North Pacific

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Author
Harr, Patrick A.
Dea, Jonathon M.
Date
2009
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Abstract
The movement of a tropical cyclone into the midlatitudes involves interactions among many complex physical processes over a variety of space and time scales. Furthermore, the extratropical transition (ET) of a tropical cyclone may also result in a high-amplitude Rossby-wave response that can extend to near hemispheric scales. After an ET event over the western portion of a Northern Hemisphere ocean basin, the highamplitude downstream response often forces anomalous midlatitude circulations for periods of days to a week. These circulations may then be related to highimpact weather events far downstream of the forcing by the ET event. In this study, downstream development following ET events over the western North Pacific is examined. Local eddy kinetic energy analyses are conducted on four cases of North Pacific tropical cyclones of varying characteristics during ET into varying midlatitude flow characteristics during 15 July – 30 September 2005. The goal is to examine the impact of each case on downstream development across the North Pacific during a period in which these events might increase midlatitude cyclogenesis across the North Pacific during a season in which cyclogenesis is typically weak. Cases are chosen to represent the wide spectrum of variability in ET. This includes a case that directly resulted in an intense midlatitude cyclone, a case in which a weak midlatitude cyclone resulted, a case in which the decaying tropical cyclone was absorbed into the midlatitude flow, and a case in which the tropical cyclone decayed under the influence of strong vertical wind shear. The variability in downstream response to each ET case is related to specific physical characteristics associated with the evolution of the ET process and the phasing between the poleward-moving tropical cyclone and the midlatitude circulation into which it is moving.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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http://hdl.handle.net/10945/48847
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