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H. F. Dacre, P. A. Clark, O. Martinez-Alvarado, M. A. Stringer, and D. A. Lavers

up water vapor as it travels. The location of the band of high water vapor travels farther from the cyclone center as the cyclone evolves because of the process of frontal fracturing. By the decaying stage of the cyclone evolution the band is >1000 km from the cyclone center. The filaments of high water vapor content seen in the Special Sensor Microwave Imager (SSM/I) satellite imagery represent the footprints left behind as the cyclone channels atmospheric moisture into a narrow band as it

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David M. Schultz and Joseph M. Sienkiewicz

Aeronautics and Space Administration (NASA) SeaWinds microwave scatterometer on the research Quick Scatterometer polar-orbiting satellite (QuikSCAT; e.g., Hoffman and Leidner 2005 ). QuikSCAT was successfully used by marine forecasters to determine extratropical cyclone intensity and wind warning categories for over 10 years from 1999 through November 2009 (e.g., Von Ahn et al. 2005 , 2006 ; Chelton et al. 2006 ). Fig . 1. QuikSCAT imagery of horizontal wind speed and direction at 0730–0733 UTC 8 Dec

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