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. 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 is displacing cold air southward, triggering unseasonable cold across locations such a...