THIRUVANANTHAPURAM: The Indian Meteorological Department has warned of heavy rains in the state for the next five days. Fishermen should not go fishing for the next three days. Yellow alert has been declared in Kollam, Pathanamthitta, Kottayam, Ernakulam, Idukki, Thrissur, Palakkad, Malappuram, Kozhikode and Wayanad districts today.