Kerala and southern Tamil Nadu coastlines face "kallakkadal phenomenon" threat with sudden sea swells until 11:30 pm Monday; INCOIS issues alerts and advises caution.

Kerala and southern Tamil Nadu coastlines face "kallakkadal phenomenon" threat, characterized by sudden sea swells causing rough waves. Authorities advise caution and adherence to safety protocols until 11:30 pm Monday. INCOIS, India's central agency for ocean information, has issued alerts, urging fishermen to refrain from venturing into danger zones and secure vessels in harbors.