Several parts of north India reeled under scorching heat on Thursday as mercury touched the 46 degrees Celsius-mark, with the weatherman predicting severe heatwave in some parts of Rajasthan. In the national capital, weather stations at Ayanagar recorded maximum temperature of 46.4 degrees Celsius. Heat wave conditions remained unabated in parts of Rajasthan where Ganganagar became the hottest place with a maximum temperature of 46.1 degrees Celsius.