Ranchi, May 30 (PTI) Four flights were diverted at Ranchi’s Birsa Munda Airport on Saturday morning due to poor visibility caused by inclement weather, an airport official said. Several parts of Jharkhand witnessed rain accompanied by thunderstorms, resulting in dense cloud cover over the airport and reduced visibility. An IndiGo flight (IGO7561) from Kolkata, scheduled to land in Ranchi at 8.05 am, was diverted and later returned at 11.59 am. Another IndiGo flight (IGO6370) from Delhi, schedule