The metropolis and several south Bengal districts were lashed by moderate rain on SundayWith the likely formation of a low pressure area over east central Bay of Bengal by Tuesday, monsoon is set to advance into West Bengal, Odisha, Sikkim and some parts of northeastern states by June 11-12, the Met department said here on Sunday.
The low pressure area is likely to move west-northwestwards and become more marked by Wednesday, regional Met director GK Das said.