A low-pressure area over North-West Rajasthan persists, and will continue to influence the weather over North-West India and adjoining East and Central India for next two to three days as well.
On Sunday morning, the parent western disturbance moved its one limb across the border into Jammu and Kashmir even as its rear limb remained perched over North Pakistan.
The combo of the western disturbance and the 'low' has already been able to create unstable weather over a wide swathe of region from North-West India to East and Central India until 5.30 am this morning.
The 'low' shows no signs of weakening, and will sustain as such, given the approach of the supportive western disturbance.
The twosome is forecast to make a move to further East across the hills and plains of North-West India.
For the rest of the day on Sunday, it would spark off heavy snow/rain at isolated places of Jammu and Kashmir, Himachal Pradesh, and Uttarakhand, an update from India Met Department said.
Thunderstorms accompanied by squall/hail would lash Himachal Pradesh, Uttarakhand, Punjab, Haryana, Chandigarh, Delhi, Uttar Pradesh, Madhya Pradesh, Chhattisgarh, Vidarbha, Telangana, Bihar, Jharkhand, hills of West Bengal and Sikkim.
To move east
The unstable weather regime will increasingly be felt towards the East of the country as the western disturbance and the 'low' move in tandem, although weakening in the process, over the next couple of days.
The Met has forecast the possibility of a follow-up western disturbance entering North-West India from Wednesday, but of weaker intensity.
Still, it will be able to drop moderate to heavy snow and rain along the higher reaches of the Himalayas and bring thundershowers to the plains of North-West India.
Meanwhile, the Met said that hailstorms were observed overnight on Sunday (until 5 am) over Uttarkhand and West Madhya Pradesh.
Thunderstorms lined up the plains across Himachal Pradesh, Uttarakhand, Haryana, Chandigarh, Delhi, Punjab, West Uttar Pradesh, Madhya Pradesh, Jammu, Odisha, Chhattisgarh, Vidarbha, Jharkhand and Bihar.