Table 3 IMD criteria for Heat wave analysis.

From: Fidelity of WRF model in simulating heat wave events over India

Region

Normal maximum temperature

Deviation from Normal temperature

Conditions

Plain area

 ≤ 40 °C

5 °C to 6 °C

Heat wave

 > 40 °C

4 °C to 5 °C

Heat wave

Coastal area

 ≥ 37 °C

 ≥ 4.5 °C

Heat wave

  1. When the actual maximum temperature persists at 45 °C or above; Heat wave should be declared irrespective of the normal maximum temperature.
Back to article page