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Polarimetric radar observations of hail formation

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dc.contributor.authorKennedy, Patrick C., author
dc.contributor.authorPetersen, Walter A., author
dc.contributor.authorRutledge, Steven A., author
dc.contributor.authorBringi, V. N., author
dc.contributor.authorAmerican Meteorological Society, publisher
dc.date.accessioned2007-01-03T08:10:58Z
dc.date.available2007-01-03T08:10:58Z
dc.date.issued2001
dc.description.abstractAnalyses are made of the evolution of selected polarimetric radar data fields during periods immediately preceding the onset of near-surface hail indicators [high reflectivity and low differential reflectivity (Zdr)] in two nonsupercellular northeastern Colorado hailstorms. The primary data were obtained from the 11-cm-wavelength, dual-polarization Colorado State University (CSU)-University of Chicago and Illinois State Water Survey radar. In one of the storms, dual-Doppler wind field syntheses were available using additional velocity data collected by the CSU Pawnee S-band radar. In both events, linear depolarization ratio (LDR) values exceeding -25 dB began to appear in the right flank of the 50-dBZ echo core region, within the 0° to 220°C environmental temperature range, approximately 10 minutes prior to the onset of hail at the surface. Scattering calculations suggest that the LDR enhancement may have been caused by an increasing water fraction within the growing hailstones (spongy hail), or the development of a liquid water coat under wet growth conditions. Vertical structure of the Zdr fields was also examined. As hypothesized by Conway and Zrnić, it was found that the distinctness of the positive Zdr column associated with supercooled raindrops and incompletely frozen particles above the 0°C height varies from storm to storm.
dc.format.mediumborn digital
dc.format.mediumarticles
dc.identifier.bibliographicCitationKennedy, Patrick C., et al., Polarimetric Radar Observations of Hail Formation, Journal of Applied Meteorology (Boston, Mass.: 1988) 40, no. 8 (August 2001): 1347-1366.
dc.identifier.urihttp://hdl.handle.net/10217/68049
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartofFaculty Publications
dc.rights©2001 American Meteorological Society.
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.titlePolarimetric radar observations of hail formation
dc.typeText

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