THIRUVANANTHAPURAM: According to the National Center for Oceanography and Research, there is a possibility of 1.3 to 1.8 meter high waves and storm surge on the Kerala coast till 8.30 pm tomorrow. In this situation, the State Disaster Management Authority has warned fishermen and coastal residents to be cautious. It has been suggested to ensure the safety of fishing vessels and equipment and to avoid trips to the beach and recreation at sea.