Ludhiana, May 25 -- The India Meteorological Department (IMD) has issued a yellow alert for warm nights from May 25 to 27 for the city that has been experiencing similar nights for around a week. The minimum temperature or the lowest temperature during the night has been above normal in the city for over a week now.

When the minimum temperature rises by over 4.6 degrees Celsius to 6deg Celsius , it is called a warm night, according to IMD's Chandigarh centre director Surender Paul. If the departure temperature (difference between observed temperature and the normal one) is more than 6deg Celsius, it is called a severe warm night. The recorded minimum temperature on Saturday was 27.8deg Celsius . It is expected only to rise in the coming ...