The India Meteorological Department (IMD) uses four colour codes -- green (no action needed), yellow (watch and stay updated), orange (be prepared) and red (take action) -- for weather warnings.
The MeT Department forecast intense spell of rainfall over sub-Himalayan West Bengal, Sikkim and the northeastern states over next the four days.
Mild dust storm with rain and hail is possible over south Delhi, Faridabad, Palwal, Agra, Mathura, Hodal, and Narnaul.
The Odisha government said disaster response and fire services teams were kept on standby following the forecast. The region witnessed cyclones in the last three summers -- Yaas in 2021, Amphan in 2020 and Fani in 2019.
With scanty rains owing to feeble western disturbances, Delhi had recorded its second hottest April this year since 1951 with a monthly average maximum temperature of 40.2 degrees Celsius.
The maximum temperature is expected to touch 39 degrees Celsius, the India Meteorological Department said.
On Saturday, the IMD said there would be some respite from the scorching heat not just for Delhi-NCR but for the northwest plains after May 1.
The heatwave is expected to abate from Monday under the influence of a western disturbance, which is likely to affect northwest India from the night of May 1, IMD said.
Apart from the heatwave forecast, IMD scientist RK Jenamani also informed that northern India will likely experience a dust storm on April 29.
Northwest India has been recording higher than normal temperatures since March last week, with weather experts attributing it to absence of active Western Disturbances.
The weatherman has predicted a mainly clear sky during the day.
The impact of the heatwave was most seen in Delhi on April 9, 10, and 11. It was the highest in the first 15 days in the last 72 years.
Delhi on Monday recorded a maximum temperature of 42.6 degrees Celsius, the highest in April in five years, according to the India Meteorological Department (IMD).
According to IMD, Delhi sizzled at 42.4 degree Celsius on Apr 9, which has been the hottest day in five years.
Heat wave conditions are likely to continue in the city for next four-five days, the weather office said.
IMD officials had said a prolonged dry spell has led to severe hot weather conditions in northwest India.
An IMD official told that in the past 120 yrs, such a dry March month was only seen 12 times. The last time it was in 2018, when the city received no rain during the month of March in Delhi.
The maximum temperatures were above normal by 4.5 degrees over most parts of Himachal Pradesh, Haryana, Chandigarh, Delhi, Punjab, and Rajasthan.
Around 100 personnel of NDRF have been deployed and six relief camps opened in various parts of the islands as a precautionary measure, the officials said.
Fishermen have been advised to return from sea. Indian Army, Navy, Air Force and Indian Coast Guard on stand by.
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