Sri Vijaya Puram, June 29: Thundersquall with gusty wind (30-40 kmph) and lightning is very likely to occur at one or two places over Andaman & Nicobar Islands. Swell waves in the range of 18.0 – 20.0 sec period with 2.0-2.3 m height have been forecasted till 23:30 hours of 30-06-2025. There is a possibility of surging of waves, boats have been advised to ply with utmost vigilance and conduct recreation with due care.