Port Blair, Oct. 19: Thunderstorm with lightning is likely to occur at one or two places over A&N Islands on Oct. 20. For further enquiries / information, one may contact helpline of State Emergency Operation Centre at Helpline No. 1070 & District Emergency Operation Centre at Helpline No. 1077.For any emergency/assistance at sea, call Coast Guard SAR Agency at Toll Free number 1554.