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Accession Number PB2013-110383
Title Polarimetric Signatures in Winter Storms.
Publication Date 2013
Media Count 27p
Personal Author A. Ryzhkov H. Reeves M. Kumjan
Abstract Over the past year, work has continued to identify repetitive polarimetric signatures associated with various microphysical processes in winter storms. Analyses of numerous case studies have revealed several such signatures, including (1) a low-level enhancement in ZDR that appears to be related to the refreezing of melted or partially melted hydrometeors, (2) downward excursions of the bright band to the surface resulting in localized regions of heavy, wet snow, (3) plumes of high ZDR associated with embedded updrafts and possibly also related to the generation of supercooled liquid water, (4) regions of high ZDR and KDP that are believed to be associated with dendritic growth and/or ice crystal generation, and (5) an apparent tendency for ZDR in the snow region to increase upon the onset of storm decay as regions of dry, aggregated snow (characterized by low ZDR) are replaced by pristine ice crystals (characterized by high ZDR). First three types of polarimetric signatures (1-3) are described herein in more detail.
Keywords Bright band signatures
Ice crystals
Polarimetric signatures

Source Agency National Oceanic and Atmospheric Administration
NTIS Subject Category 48H - Snow, Ice, & Permafrost
55C - Meteorological Data Collection, Analysis, & Weather Forecast
55E - Physical Meteorology
97R - Environmental Studies
55B - Dynamic Meteorology
Corporate Author National Severe Storms Lab., Norman, OK.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1323
Contract Number N/A

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