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Toshi Matsui, Jiun-Dar Chern, Wei-Kuo Tao, Stephen Lang, Masaki Satoh, Tempei Hashino, and Takuji Kubota

microphysics processes, accretion of supercooled cloud droplets onto ice crystals, and collision between the crystals and graupel particles ( Williams et al. 2002 , 2005 ; WS02 ; Takahashi 1978 ). WS02 pointed out that the width of a thermal plume could be associated with the boundary layer height based on the classic similarity theory of Morton et al. (1956) . This simple parcel theory showed that a buoyant thermal parcel originating from point sources has a constant expansion (~10° expansion angle

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Chris Kidd, Toshihisa Matsui, Jiundar Chern, Karen Mohr, Chris Kummerow, and Dave Randel

submitted to J. Adv. Model. Earth Syst. ). This new scheme predicts an explicit hail category in addition to existing hydrometeor categories (cloud, rain, ice crystals, snow aggregate, and graupel). The occurrence of hail in convective cores is relatively rare and its spatial coverage is also very small (less than a few percent), but it improves the representation of strong precipitation intensity and the strong depression of microwave Tbs associated with convective core structure. Vertical levels

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