Hyderabad, A low pressure area is likely to form in West-Central Bay of Bengal off Andhra Pradesh Coast by Sunday, Meteorological Centre said on Saturday.In a special bulletin here, it said that the east-west shear zone roughly along 15?North across peninsular India now seen at 5.8 km above mean sea level.A cyclonic circulation lies over west-central Bay of Bengal off Andhra Pradesh Coast and extends upto 3.1 km above mean sea level. Under its influence, a low pressure Area is likely to form over West-central Bay of Bengal off Andhra Pradesh coast by tomorrow.The trough from Bihar to South Chhattisgarh across Jharkhand has become less marked.Met also warned that thunderstorm accompanied with lightning is likely to occur at isolated places in Telangana during the next five days starting from today, while heavy to very heavy rain is likely to occur at isolated places in the state on September 13 and 14, the bulletin added.