New Delhi, May 23 -- At least 59 people in two states died due to incidents connected with a thunderstorm that ripped through swathes of northern India late on Wednesday, officials said on Thursday. According to authorities, 56 people were killed in Uttar Pradesh and three in Delhi. Meteorologists studying the storm said the system was the product of a complex atmospheric cocktail - multiple cyclonic circulations, abundant moisture from two seas on either side of the subcontinent, and extreme daytime heating-all supercharged by unusual persistence of the winter weather system known as Western Disturbances that should have retreated by now. The phenomenon appears linked to unusual weather continents away-record heat in the Arctic Circle that...