New Delhi: With temperatures surpassing the 45 degrees Celsius-mark across several parts in north India, the India Meteorological Department (IMD) on Sunday issued a "red" warning for Delhi, Punjab, Haryana, Chandigarh and Rajasthan for the next two days.

The IMD has also issued an orange warning for heatwave for east Uttar Pradesh, said Kuldeep Srivastava, the head of IMD's Regional Meteorological Centre.

He cautioned that temperatures could soar up to 47 degrees Celsius in some parts over the next 2-3 days. This is also for the first time this summer season that a red warning has been issued for heatwave, Srivastava said.

This season, the temperatures did not rise the way it usually does in north and central India because of significant rainfall activity during April that continued till mid-May.

On Saturday, Pilani in Rajasthan recorded 46.7 degrees Celsius.

"Heatwave conditions over some parts with severe heatwave over isolated pockets are very likely over Punjab, Haryana, Chandigarh, Delhi, Rajasthan, Uttar Pradesh, Madhya Pradesh, Vidarbha and Telnagana during the next five days," the IMD said in its daily bulletin.

It added that heatwave conditions in isolated pockets over Chhattisgarh, Odisha, Gujarat, central Maharashtra and Vidarbha, coastal Andhra Pradesh, Yanam, Rayalseema and north interior Karnataka are also likely during the next 3-4 days.

A heatwave is declared when the maximum temperature is at least 40 degrees Celsius and the departure from normal temperature is 4.5 degrees Celsius to 6.4 degrees Celsius.

For the plains, a heatwave is declared when the actual maximum temperature is 45 degrees Celsius and severe heatwave when it is 47 degrees Celsius or above.

The IMD issues colour-coded warnings depending on the intensity of any weather system in ascending order green, yellow, orange and red.

Srivastava said the red warning has been issued to caution people not to step out during 1 pm to 5 pm, when the intensity of the heat is the most.

Naresh Kumar, a scientist with the National Weather Forecasting Centre of the IMD, said due to dry north-westerly winds and a trough between Chhattisgarh and Tamil Nadu, conditions are favourable for heatwave to severe heatwave.

Kumar said relief is only expected after May 28 as a western disturbance is likely to bring some rainfall.

A western disturbance is a cyclonic storm that originates in the Mediterranean and travels across Central Asia. When it comes in contact with the Himalayas, it brings rains to the hills and plains.

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New Delhi (PTI): The National Investigation Agency (NIA) on Sunday registered a case to probe recovery of 79 crude bombs in poll-bound West Bengal, officials said.

The move came following a directive by the Union Home Ministry in this regard, they said.

In pursuance to the home ministry's order, the anti-terror agency on Sunday registered a case, which was originally filed at Uttar Kashi police station, Bhangar division, Kolkata on Saturday, and took up the investigation, an NIA spokesperson said in a late night statement.

"The case pertains to recovery of 79 crude bombs and other incriminating materials by Kolkata police, which were being stored at a spot, thereby endangering human life and property," the spokesperson said.

Earlier in the day, the Election Commission had directed the West Bengal Police to launch a special drive to arrest those involved in illegal manufacturing of crude bombs in the poll-bound state, an official said.

It asserted that all cases related to the making of any such explosive would be probed by the National Investigation Agency, the official said.

The directive came after the police recovered a large number of crude bombs from the house of a person, allegedly a TMC worker, at Bhangar in South 24 Parganas district, days ahead of the second and final phase of the assembly polls in the state.

The explosives were recovered during a search at the residence of Rafikul Islam following specific inputs, the official said.

The poll panel also issued a warning to senior police officers across the state over any lapse in maintaining law and order before the April 29 polling.

The first phase of the assembly elections in West Bengal was held on April 23, while the second phase will take place on April 29. Votes will be counted on May 4.

A record 93.19 per cent turnout has been recorded in the first round of polling. Bhangar will vote in the second phase.