Port Blair, Aug. 22: Thunderstorm with lightning is likely to occur at one or two places over Andaman and Nicobar Islands on Aug. 23. For further enquiries / information 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.