Explanation:

Only statements 1&3 are correct.
Kallakkadal

• Kallakkadal is essentially coastal flooding during the pre-monsoon (April-May) season by swell waves on the southwest coast of India.

• It is also known as swell surge.

• Ocean swells occur not due to the local winds, but rather due to distant storms like hurricanes, or even long periods of fierce gale winds.

• In 2012, the term was formally approved by the United Nations Educational, Scientific and Cultural Organization (UNESCO).

• Usually, Kallakkadal is a consequence of the strong winds in the southern part of the Indian Ocean, where an ocean swell is generated, and the waves then travel north to reach the coast in 2 or 3 days.

• Kallakkadal occurs without precursors or any kind of local wind activity and as a result, it has been very difficult for the coastal population to get an advance warning.

• The early warning systems like the Swell Surge Forecast System launched by the Indian National Centre for Ocean Information Services (INCOIS) gives forewarning 7 days in advance.

• Kallakkadal is often mistaken to be a tsunami, which is a series of enormous waves created by an underwater disturbance usually associated with earthquakes occurring below or near the ocean.

• The swell surge is likely to continue impacting Kerala and other western coast regions of the country.

Hence option 2nd is correct.