Predictability of Local Thunderstorms and Ass...

Predictability of Local Thunderstorms and Associated Moisture and Precipitable Water Content Prior to the Monsoon Over Kolkata Region, West Bengal (India)

Author Name : Tashmita Bose Sinha

ABSTRACT The current study focuses on the local thunderstorms in Kolkata.9 thunderstorm days are considered in this study. The mixing ratio ranges at 00 and 12 UTC varies between 16.23g/kg to 23.67g/kg at 1000 hPa. This indicates a significant presence of moisture near the surface. In the occurrence of local severe storms in Kolkata, the relative humidity at 00 and 12 UTC ranges from 52% to 100%, indicating a substantial amount of moisture near the surface. The mean mixed layer mixing ratio in Kolkata the occurrence of thunderstorms varies from 13 g/kg to 22.17 g/kg, showing a significant amount of moisture in the mixed layer of the troposphere. The amount of precipitable water in Kolkata during local storms at 00 and 12 UTC varies from 36.70 mm to 56.58 mm. It is worth noting that the precipitable water in Kolkata was significantly higher during local storms at 00 UTC compared to days when no storms occurred. DRCT varies from 45 deg to 290 deg and SKNT varies from 1 to 8 knot at 00 and 12 UTC.