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Storm characteristics and precipitation estimates of monsoonal clouds using C-band polarimetric radar over Northwest India

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Abstract

Storm is a convective cell much smaller than a mesoscale convective system (MCS) but typically larger than a cumulonimbus cloud and heavy precipitation and lightning are often associated with it. Storms contribute major fraction of the convective precipitation in MCSs. Storm characteristics and precipitation estimates around New Delhi (28.6°N, 77.2°E; an Indian land location) during June–September period of the year 2013 are reported here using data of C-band polarimetric Doppler weather radar. Storms, defined based on radar reflectivity thresholds (30 dBZ for simple storms and 40 dBZ for intense storms), are tracked and their properties are extracted. Our results show that about 80% of storms exist for 1 h or less. The areas of 90% of simple storms are less than 100 km2 and the largest area averaged over storm lifespan does not exceed 400 km2. The majority of storms (> 80%) move with speeds less than 30 km h−1. About 60–65% of simple/intense storms have echo top heights between 6 and 10 km, while only few of them exceed 17 km. The values of average thickness of simple and intense storms lie between ~ 2–10 and ~ 1–7 km, respectively. It is not the vertical extent of a storm but its area-time integral that correlates better with the total precipitation amount. Around the New Delhi area, daily accumulated precipitation derived from relations incorporating polarimetric variables is in good agreement with the rain gauge measurements while that obtained from relations based on radar reflectivity factor (Zh) alone highly underestimates precipitation. This suggests that polarimetric capability is needed in Doppler weather radars to get the realistic precipitation estimates. The mean precipitation water content derived from Zh (~ 0.96 g m−3) is about 30–40% less compared to that derived from polarimetric relations. Our findings on storm properties have implications for cloud parameterizations and in short-term weather forecasting.

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Acknowledgements

Authors thank IMD and the CTCZ program of the Ministry of Earth Sciences, Government of India, New Delhi (India) for providing DWR and Kalpana-1 satellite data. Authors thank Mr. Michael J. Dixon, UCAR for his valuable discussion regarding radar data processing using the Radx-algorithm.

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  1. Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science Bangalore, Bangalore, 560012, India

    Kapil Dev Sindhu & G. S. Bhat

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  1. Kapil Dev Sindhu
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Correspondence to Kapil Dev Sindhu.

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Sindhu, K.D., Bhat, G.S. Storm characteristics and precipitation estimates of monsoonal clouds using C-band polarimetric radar over Northwest India. Theor Appl Climatol 138, 237–248 (2019). https://doi.org/10.1007/s00704-019-02828-6

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