Abstract
During premonsoon season (March to May) convective developments in various forms are common phenomena over the Gangetic West Bengal, India. In the present work, simulation of wind squall on three different dates has been attempted with the help of mesoscale model MM5. The combination of various physical schemes in MM5 is taken as that found in a previous work done to simulate severe local storms over the Gangetic West Bengal. In the present study the model successfully simulates wind squall showing pressure rise, wind shift, wind surge, temperature drop, and heavy rainfall, in all cases. Convective cloud development and rainfall simulation by the model has been validated by the corresponding product from Doppler Weather Radar located at Kolkata and TRMM satellite product 3B42 (V6), respectively. It is found that the model is capable of capturing heavy rainfall pattern with up to three-hour time gap existing between simulation and observation of peak rainfall occurrence. In all simulations there is spatial as well as temporal shift from observation.
Highlights
Over the Gangetic Plain of West Bengal (GWB), India, and its surroundings, several types of convective developments occur during premonsoon season (March to May)
In the present study we have considered three local convective storms cases with wind squalls to find the performance of MM5 in local convective storm simulation over GWB
From the above study we have found some strength and some weakness of the model MM5 for simulation of Nor’wester
Summary
Over the Gangetic Plain of West Bengal (GWB), India, and its surroundings, several types of convective developments occur during premonsoon season (March to May). The most dominant formations are known as Nor’wester. This type of thunderstorm development occurs due to collision of two different kinds of air masses, that is, the dry land based airmass coming from northwest and the moist hot maritime airmass coming from south or southeast. GWB and neighbouring Bangladesh experience these Nor’westers, which are locally called Kal Baisakhi. They produce squall line, wind squall, heavy rain showers, hailstorm, and tornadoes which appear as natural hazard. They pose serious hazards to aviation activities
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