The very severe cyclonic storm 'Yaas' is likely to move north-northwestwards further and may cross the northern Odisha-West Bengal coast by Wednesday noon.   Around 3 am on Wednesday,  Yaas was centred about 515 kms southwest of Chattogram port, 505 kms southwest of Cox's Bazar port, 320 kms south-southwest of Mongla port and 350 kms south-southwest of Payra port, the Met office said in a special bulletin.   The maximum sustained wind speed within 84 kms of the very severe cyclone centre is about 130 kmph, rising to 150 kmph in gusts or squalls. Sea will remain very high near the very severe cyclone centre, the Met office said.   Maritime ports of Chattogram, Cox's Bazar, Mongla and Payra have been advised to keep hoisted local cautionary signal number three (r) three.   The districts of Khulna,Satkhira, Bagerhat, Jhalakati, Pirojpur,  Barguna, Patuakhali, Barisal, Bhola, Noakhali,  Feni,  Laxmipur, Chandpur and Chattogram and their offshore islands may experience wind speed of up to 80-100 kmph in gusts or squalls with heavy to very heavy showers during the passage of the storm.   Also read: Cyclone Yaas: Low-lying districts flooded as water level rises   Under the influence of very severe cyclone and the full moon phase, the low-lying areas of the districts of Khulna, Satkhira, Bagerhat, Jhalakati, Pirojpur, Barguna, Patuakhali, Barisal, Bhola, Noakhali, Laxmipur, Feni, Chandpur and Chattogram are likely to be inundated by 03-06 ft height above normal astronomical tide. Also read: Cyclone Yaas: Maritime ports in Bangladesh asked to hoist signal No 3   All fishing boats and trawlers over the north bay and deep sea have been advised to remain in shelter until further notice.