Massive sust storms and high-speed winds swept across the national capital on Monday night amid an ongoing yellow alert for thunderstorms and rain in the city. Light rain brought relief from the sxcorching heat. After a prolonged spell of heatwave-like conditions, weather experts attributed the change to an ongoing cyclonic circulation over central Pakistan, northwest Rajasthan, Punjab and Haryana. They said the circulation is moving towards the northeast of the country, bringing with it dust and sand from Rajasthan, leading to dust storms in the region.