Updated on 30 May, 2019
Severe Heat Wave conditions over plains of Northwest IndiaContext:
- For the last 4-5 days, the sky is mainly clear over Northwest India and there is no thundershower activity.
Heat Waves Warnings for next 4-5 days
- As a result, rise in maximum temperatures by around 2-4 °C were experienced over parts of Northwest India including Delhi NCR.
- Heat Wave conditions also developed over parts of Uttar Pradesh, Rajasthan and Delhi NCR.
- The highest maximum temperature in the plains of Northwest India was 47.6°C recorded at Prayagraj (Uttar Pradesh) on 29 May 2019.
- Weather observations are indicating mainly clear sky over plains of Northwest India including Delhi-NCR till 3 June.
- Advection of heat from west, subsidence over the region and lack of Rain/Thunderstorm activity will lead to further rise in Maximum temperatures by about 2°C in the region.
- A Western Disturbance is likely to affect western Himalayan region mainly from 02 June. However, it is unlikely to cause significant Thunderstorm activity over the plains.
- Heat wave conditions likely to prevail at isolated places over Jammu area during next 72 hours.
- Heat wave conditions likely to prevail at many places with Severe heat wave at a few places over East Uttar Pradesh and West Rajasthan.
- Heat wave conditions likely to prevail at many places with Severe heat wave at isolated places over West Uttar Pradesh, Haryana, Delhi NCR and East Rajasthan.
- Heat wave conditions likely at a few places over Punjab and Chandigarh.
What is a Heat Wave?
- Well, the heat wave is considered if maximum temperature of a station reaches at least 40°C or more for the Plains, 37°C or more for coastal stations and at least 30°C or more for Hilly regions.
- Following criteria are used to declare heat wave:
- Based on Departure from Normal:
- Heat Wave: The departure from normal is 4.5°C to 6.4°C.
- The severe Heat Wave: The departure from normal is >6.4°C.
- Based on Actual Maximum Temperature (for plains only):
- Heat Wave: When actual maximum temperature ≥ 45°C
- Severe Heat Wave: When actual maximum temperature ≥47°C
- To declare heat wave, the above criteria should be met at least in 2 stations in a Meteorological sub-division for at least two consecutive days and it will be declared on the second day.
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- Higher daily peak temperatures and longer, more intense heat waves are becomingly increasingly frequent globally due to climate change.
- In fact, India is also feeling the impact of climate change in the terms of increased instances of heat waves which are more intense in nature with each passing year, and have a devastating impact on human health.
- Moreover, the health impacts of Heat Waves typically involve dehydration, heat cramps, heat exhaustion and/or heat stroke.
- Children, the elderly and those with pre-existing morbidities are particularly vulnerable.