The pre-monsoon showers in Kerala and coastal Karnataka that help mangoes ripen are popularly called

Explanation

1. 01

   In April and May thunderstorms bring early showers to Kerala and coastal Karnataka, just as mangoes are ripening, so they are called mango showers.

2. 02

   Kalbaisakhi is the violent evening storm of Bengal, and loo is the hot, dry summer wind of the northern plains.