After a brief respite, temperatures have risen again in recent days: an endless heat wave that has lasted since the end of March. Jacobabad, in Pakistan, reached the threshold of + 51°C on Friday 14 May. the highest temperature on the planet of 2022.
These heat waves also represent a danger to the survival of many people as the WHO recalls. Extreme heat can cause problems not only from heatstroke, but also hyperthermia which could lead to death in the case of people with heart and respiratory problems.
We recall that extreme heat and humidity killed 3,700 people in India and Pakistan in 2015. This year, there are 25 casualties to date, but scientists believe the heat spike has not yet arrived. An anomaly has been occurring in India and Pakistan for several years now: heat waves have doubled in recent decades, as a direct consequence of the Climate Crisis.
India recorded its the warmest March in meteorology history this year. Furthermore, the duration of these heat waves is indisputably long. make a difference in this long episode that began in March; they are affected by a stationary promontory which developed in March and which dominated this area.
Let's do an analysis:
Why this abnormal heat in India and Pakistan?
Spring circulation was forced by the dynamic Final Warming. Anomalies between Europe, North Africa and South Asia and weakening of the polar jet have caused a shift north towards India of the sub-tropical one.
Madden Julian Oscillation firm convective activity on the Ocean has resulted in this situation and also a new intensification of La Nina. The United Nations World Meteorological Organization said temperatures in India and Pakistan are consistent with what is expected in a changing climate.
Heat waves are more frequent and more intense and start earlier than in the past. Nearly 1 billion people were exposed to temperatures above 40 degrees in April, including around 130 million to temperatures higher than 45 degrees.
India's vulnerability to extreme heat increased by 15% between 1990 and 2019 according to a study published on Lancet.