The dreaded evening thunderstorm in Bengal and Assam are known as:

The correct answer is Norwester . Key Points Norwesters: It is also known as Kalbaishakhi or Bordoisila . It is an isolated rainfall and thunderstorm that occurs in India and Bangladesh, associated with violent hurricane-speed winds. It occurs with increasing frequency, from March till monsoon establishes over the region of North-East India. These rainfall storms are beneficial for the cultivation of tea in Assam and for the jute and rice and tea cultivated in West Bengal and Bangladesh . Mango Shower: This term uses to describe the occurrence of pre-monsoon rainfall . These rains are referred to as ‘April rains’ or ‘Summer showers’ . These occur in the region of South and Southeast Asia , including India, and Cambodia. In southern Asia, these rains influence human activities because of the control the rains have on crops that are culturally significant like mangoes and coffee . Chinook: Chinook winds in the interior West of North America . These flows in the region, where the Canadian Prairies and Great Plains meet various mountain ranges, although the original usage is in reference to wet, warm coastal winds in the Pacific Northwest. The term "Chinook" originates from the language spoken by the people in the region along the lower Columbia River. Loo: It is a strong, dusty, gusty, hot, and dry summer wind from the west which blows over the w estern Indo-Gangetic Plain region of North India and Pakistan . It is mainly strong in the months of May and June. Because of its very high temperatures, exposure to it mainly leads to fatal heatstrokes . Due to its extremely low humidity and high temperatures, the Loo also has a severe drying effect on vegetation leading to widespread browning in the areas affected by it during the months of May and June .