Mercury dropped marginally in some parts of northern India, including the National Capital, on Friday providing some respite to the people, even as 10 people perished in a thunder squall that lashed nine districts of Orissa. Delhiites experienced a slightly less warm day, with the mercury settling at 40 degrees Celsius, two degree down from Thursday's 42.2 degrees.

Meanwhile in Orissa, the deaths due to squall occurred in the Khurda, Mayurbhanj, Keonjhar and Sundargarh districts, while 25 people were injured when lightning struck a marriage reception party in Sundargarh.

Heat conditions relented in the plains of Punjab and Haryana, with mercury dropping by upto 4 degrees below normal in the region.

Chandigarh recorded a temperature of 35.3, down by three notches, Meteorological Department said here on Friday.

In Haryana, Ambala, Karnal and Rohtak recorded a high of 34.7, 34.4 and 39.9 respectively.

Amritsar, Ludhiana and Patiala in Punjab recorded day temperature of 39.8, 37.8 and 36.1 respectively.

Thunderstorm and light rains also brought relief to the people in Uttar Pradesh. Lucknow recorded a day temperature of 36.1, four notches below normal. — PTI