Which phenomenon causes 'Kal Baisakhi' in West Bengal?
- Western Disturbances
- Local thunderstorms
- Bay of Bengal cyclones
- Retreating monsoon
Answer: Local thunderstorms
Kal Baisakhi (Nor'westers) are violent evening thunderstorms in West Bengal and Assam during April-May. They bring heavy rain, lightning, and strong winds, providing relief from pre-monsoon heat. They are caused by local convection and moisture from the Bay of Bengal.