Thiruvananthapuram, May 31 (Reporter) As Southwest monsoon has been active over Kerala, heavy (7-11cm in 24 hours) rainfall is very likely to occur at isolated places over Kerala from May 31 to June 4. Heavy rainfall (7- 11 cm in 24 hours/orange warning) is very likely to occur at one or two places in the districts of Alappuzha, Ernakualm, Kannur and Kasaragod on May 31. Heavy rainfall (7- 11 cm in 24 hours/yellow warning) is very likely to occur at one or two places in the districts of Thiruvananthapuram, Kollam, Pathanamthitta, Kottayam, Idukki, Thrissur, Palakkad, Malappuram, Kozhikode & Wayanad on May 31. Rain occurred at most places in Kerala and Lakshadweep on Saturday...////...