As of 0830 IST (0300 UTC), 16 May 2013, Cyclonic Storm Mahasen was located near latitude 21°N and longitude 90°E, about south-southeast of Kolkata and southwest of Chittagong. The storm is forecast to maintain power. It is moving northeastwards. It is expected to cross the Bangladesh coast close to Chittagong by evening of 16 May. Sustained maximum surface wind speed is estimated at , gusting to . Estimated minimum central pressure is at 988 mbar. Dvorak intensity of the storm is at T2.5.