Hyderabad, July 17 -- Heavy rainfall is likely to occur in some parts of Telangana during the next four days, Meteorological Centre said today. In a daily weather report here, it said that thunderstorms accompanied by lightning are likely to occur at isolated places in all districts of the state during the next three days and at isolated places on July 21. Strong surface winds with speed ranging from 30-40 km per hour are likely to occur at isolated places in all districts of Telangana during the next five days. Light to moderate rain or thundershowers is likely to occur at many places or at a few places over the state during the next seven days. Southwest monsoon has been weak over Telangana. Heavy rainfall occurred at isolated places in B...