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  • DYNAMO/CINDY/AMIE/LASP: Processes, Dynamics, and Prediction of MJO Initiation x
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Nick Guy and David P. Jorgensen

bright band is associated with the stratiform region of a convective system where the terminal velocities of ice crystals may overcome the relatively modest vertical motions and begin a downward descent and melt during transition through the freezing level. Below the bright band, reflectivity remained nearly constant toward the surface during the active phase. However, in the inactive phase there is a small decrease in reflectivity near the lowest levels (<1.5 km) that could be an indication of an

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Elizabeth J. Thompson, Steven A. Rutledge, Brenda Dolan, and Merhala Thurai

), which was verified by observations of D 0 near 1.9 mm at this time. Near-surface Z dr was 0.5–1 dB, and surface rain rates were just under 10 mm h −1 . The layer of near-zero Z dr just above the bright band and increasing Z dr with altitude toward echo top above the disdrometer suggest pristine ice crystal growth near cloud top and subsequent aggregation above the melting layer ( Ryzhkov et al. 2005 ; Kennedy and Rutledge 2011 ; Thompson et al. 2014 ). Braun and Houze (1994) highlight

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