The monsoon continues to remain in the weak phase and has not made much progress. It is likely to cover the area from Bihar to Maharashtra in the next 3-4 days and is expected to strengthen in the days ahead, says India Meteoroligical Department(IMD). According to the weather forecaster, conditions\u00a0are\u00a0favourable\u00a0for\u00a0further\u00a0advance\u00a0of\u00a0southwest\u00a0monsoon\u00a0into\u00a0some\u00a0more\u00a0parts\u00a0of\u00a0central\u00a0Arabian\u00a0Sea,\u00a0entire\u00a0Goa, some\u00a0parts\u00a0of\u00a0Konkan,\u00a0south\u00a0Madhya\u00a0Maharashtra\u00a0&\u00a0Marathawada,\u00a0remaining\u00a0parts\u00a0of\u00a0north\u00a0interior\u00a0Karnataka and no heat wave is observed over the country. IMD expects thunderstorm\u00a0accompanied\u00a0with\u00a0squall\u00a0at\u00a0isolated\u00a0places\u00a0over\u00a0Himachal\u00a0Pradesh,\u00a0Uttrakhand,\u00a0Punjab\u00a0and\u00a0Haryana, Chandigarh, Delhi\u00a0and\u00a0Uttar\u00a0Pradesh. However, rains are now all set to pick pace up pace after next 24 hours in Mumbai. According to Skymet Weather, a cyclonic circulation is likely to form over west-central Bay of Bengal around June 17 and gradually move inland in west direction. Further by June 20 and June 21, moderate to heavy rain and thundershowers are expected to lash Mumbai and nearby areas. As per the weathermen at Skymet Weather, this rainy spell may mark the onset of much-awaited Monsoon over Mumbai.