By Admin 
Cold Wave Warning: Winter has taken hold in North India. Now the effect of cold is clearly visible in the morning and late evening. Cold wave warning has been issued by the Indian Meteorological Department in many areas such as East Rajasthan, Madhya Pradesh, Uttar Pradesh, Jharkhand and Chhattisgarh. But the question arises as to how severe the cold wave warning is issued by the Meteorological Department. Also, how is this thing decided? Let us know.
Absolute minimum temperature as the first indicator
The first parameter of IMD is based on the actual minimum temperature recorded at a place. Like for the plains the border is absolutely clear. The temperature here should fall to 10 degrees Celsius or below. Apart from this, if we talk about the hilly area then it becomes even more dangerous because here a cold wave is declared when the temperature falls to 0 degree Celsius or below. Not only this, due to the mild winter pattern in the coastal areas, cold wave is declared when the minimum temperature is 15 degrees Celsius or less.
second criterion
Every region has an established normal minimum temperature for each time of the year, based on decades of data. When the actual temperature drops sharply below this normal level, the Meteorological Department considers it as a possible cold wave. A fall of 4.5 degrees Celsius to 6.4 degrees Celsius is considered as a severe cold wave, while a fall of 6.4 degrees Celsius or more is considered as a severe cold wave.
Why are these two criteria needed?
Actually the climate of India is quite diverse. What is considered cold in Rajasthan is quite different from the cold in coastal Tamil Nadu. For this reason the Meteorological Department uses both criteria to avoid incorrect or misleading classification.
How does the Meteorological Department decide to issue a warning?
The Meteorological Department monitors temperatures through a network of local observatories, Doppler radar and real-time data systems. A cold wave warning is issued when one or more criteria are met for at least two consecutive days. These warnings are then published on the Meteorological Department platform and shared with the state authority for timely public advice.
Role of real time data in warning
IMD depends heavily on the latest updates received from automated weather stations. These record the continuously changing temperature. Any sharp or sudden decline is marked and checked against general climate data. This entire process helps meteorologists to detect early signs of cold wave conditions.
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