Port Blair, June 19: Thunderstorm with lightning accompanied with gusty wind (speed reaching 30-40 kmph) is likely to occur at one or two places over A&N Islands on June 20 & 21. 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.