Mumbai: Heavy rains and strong winds disrupted flight operations at the Mumbai airport on Sunday, with the runway shut for an hour in the morning due to poor visibility. Delhi too had inclement weather with sudden heavy rains in the morning, which impacted flights in Mumbai as well. By evening, four flights were cancelled, and 13 arrival flights were diverted, said sources. Among the cancelled flights were two on the Delhi-Mumbai sector and two on the Mumbai-Indore sector. Most arrivals and departures operated with delays through the day. Passengers booked to fly on Monday to or from Mumbai should check the airline website for their flight status before leaving for the airport, said an airline official.“At 10.17 am, adverse weather conditions, including strong gusty winds of up to 42 kts and reduced visibility due to heavy rain, impacted runway operations,” said a statement by Mumbai International Airport Ltd (MIAL). With visibility falling below the minimum mandated for safe operations, the airport suspended flight operations for an hour up to 11.17 am. Aviation weather report showed an overcast sky at 8,000 feet and visibility drop in the morning. According to flight tracking websites, close to 90% of departures were delayed; a flight that departs 15 minutes or more from the scheduled time of departure is considered delayed.