Extreme positive departures from the normal maximum temperature result in heat waves during the summer season, tte rising maximum temperature during the pre-monsoon months often continues till June, even in rare cases till July over the northwestern parts of the country.
Raghavan (1966) made an extensive study of the heat wave spells of the last century for the period from 1911 to 1961. His study indicated that the maximum number of heat waves occur over East Uttar Pradesh followed by Punjab, East Madhya Pradesh and Saurashtra & Kutch in Gujarat. Notably the period roughly coincided with last two decades of the twentieth century which witnessed unprecedented high temperatures globally as a result of the global warming. Number of heat waves from 1901-2006 are given in Table 6.3.
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