Convective Vorticity Vector Analysis of a Heavy Rainstorm under Long Distance Influence of Typhoon
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Abstract:
An analysis is made of a heavy rainstorm under the long distance influence of the Typhoon from 16 to 19 July 2010 from convective vorticity vector (CVV) on the basis of conventional observation data, NCEP reanalysis data, automatic station data, and satellite cloud data. The results show that the high 〖WTBX〗θ〖WTBZ〗e value area located in the warm wet airflow on the south side of southwest vortex; the 〖WTBX〗θ〖WTBZ〗e contours over the heavy rainstorm center were nearly vertical, which presented a funnel shaped structure,and there was a deep moist column of 90% relative humidity from low levels to the tropopause； the northeast southwest upper jet strengthened the high level divergence on the right side of the jet entrance region, which caused deep and strong vertical ascending motion over the heavy rainstorm area；there existed southeast winds at low levels, southwest winds at middle levels and northwest winds at high levels; there was great convective instability over the heavy rainstorm and obvious latitudinal wind shear at middle levels and meridional wind shear at mid upper levels over the heavy rainstorm centers. The heavy rainstorm appeared in the coincidence area of the large CVV and atmospheric column cloud water.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.