Mexico City – Tropical Storm Lidia lashed Mexico's resort-studded southern Baja California Peninsula with heavy rains, as about 1 400 people sought refuge at storm shelters in the Los Cabos resorts.Lidia spread rains over a broad swath of Mexico, including Mexico City, where it was blamed for flooding that briefly closed the city's airport. An enormous sinkhole about 10 metres in diameter opened on a street in downtown Mexico City, because of an accumulation of water.Civil Defence Commissioner Luis Felipe Puente said strong winds and rain were already lashing Los Cabos at midday. Authorities also warned residents to prepare for a possible dangerous storm surge.The US National Hurricane Centre said Lidia could produce total accumulations of as much as 20 to 30 centimetres across much of Baja California Sur state and western Jalisco state on the mainland, threatening flash floods and landslides.Lidia had maximum sustained winds of 100km/h early on Friday with weakening expected over the next few days as the storm reaches the mountainous terrain of Baja California. Its centre was about 85km west-southwest of La Paz and was heading northwest near 13km/h.The storm was predicted to move northward about halfway up the peninsula over the next two days before turning out into the Pacific.Far out over the Atlantic, meanwhile, Hurricane Irma formed and strengthened to a category 3 storm while following a course that could bring it near the eastern Caribbean Sea by early next week. Its maximum sustained winds had increased to near 185km/h.Irma was moving west-northwest near 19km/h and that general motion was forecast to continue through early on Friday.Forecasters said Irma was expected to be an extremely dangerous hurricane for the next several days. No coastal watches or warnings were in effect.