Heavy rains accompanied by gusty winds have been lashing Srikakulam, Vizianagaram and Visakhapatnam districts since early Sunday.
However, parts of the national capital did see some rains with the Palam observatory recording 4 mm of rainfall in the last 24 hours.
According to the IMD, thunderstorms also occurred at isolated places in Himachal Pradesh, Uttarakhand, Punjab, Haryana, Chandigarh, Madhya Pradesh, Jharkhand, Assam, Meghalaya, Maharashtara, Karnataka, Kerala and Tamil Nadu.
The Met official said that Sunday morning was the hottest of the season, with minimum temperature recorded at 30.6 degrees Celsius, five notches above the season's average.
"A cyclonic circulation formed near Haryana and north Rajasthan along with the western disturbance".
On Monday, the Indian Meteorological Department (IMD) issued severe weather warnings for several states for the next two days (Monday and Tuesday).
Several parts of Uttarakhand, Uttar Pradesh, Jammu and Kashmir and Himachal Pradesh are also likely to witness thunderstorm accompanied with gusty winds today. A woman was killed and her son was critically injured after an illegal hoarding fell on them in Greater Noida. In southeast Delhi's Jaitpur, a man died after a cement slab fell on him. He was rushed to the hospital but died en route, said police.
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The relief commissioner's office, although, has confirmed only 18 deaths besides two dozen injuries in Sunday's dust storm.
Police said Somvati Sinha was out for an evening walk when the mishap happened.
Traffic in many areas moved at a snail's pace due to the reduced visibility.
"About 10 flights destined for Delhi had to be diverted to nearby airports during the first half an hour of the storm", an airport source said. Almost 31 domestic flights and six worldwide flights were delayed following the dust storm.
According to the chief meteorologist at the IGI Airport Met station, strong winds for such a prolonged time are unusual.
"Till about 7.15 PM, over 40 diversions were reported". Forty-seven flights were diverted. Delhi Metro service was also stopped for 30 minutes.