What is heat index? Why is the temperature that the thermometer does not show more important?

Thermometer shows 35 degrees. But when you go out, the temperature you feel is much higher. This is because not only sun rays; the moisture in the air also directly affects the body's body's body's body's shape.
Here at this point the activated heat index, i.e. the preferred temperature. Science states that people reconcile existing heat index calculations of excessive hot air waves, which are more often seen with climate change. Because according to some research, the methods used today are very hot and humid conditions, it can show low as the actual heat stress exposed to the human body.

[What is index?]
Heat index is a measure that calculates the relative humidity with air temperature and how human body feels the temperature. Therefore, the “hised temperature” value, which is often seen in meteorology applications, takes into account not only the air temperature measured in the thermometer, but also the effect of moisture.
For example, air temperature can be 35 degrees. But when the moisture rate rises, the body does not cool enough through sweat and the temperature felt can be over 40 degrees. So the same temperature value can create very different effects on the human body in different regions or different days.
] Experts note that not only air temperature during hot air waves, but also the heat index is a more accurate approach to assess health risks.

Why does not increase the temperature felt?][
The human body is refreshing naturally through sweating. The body heat drops as steamed from the skin surface and overheating is avoided. But this process slows down when the humidity increases in the air.
In the days where the moisture rate is high, the sweat can not be easily steamed. As a result, the body is forced out of heat and the person feels much higher than the value that appears in the thermometer. This condition can create serious health risks for people with hot plant, thirst, hot stroke and especially old people, chronic disease with children.
For this reason, experts recommend not only temperature predictions in extreme hot periods, but also to follow the heat index values formed together with temperature and humidity.

Why do people discuss the heat index?]
The concept of heat index was first developed by physicist Robert Steadman in 1979. Then the US National Weather Service (NWS) created the heat index calculation method used today based on this study.
However, with climate change, more often, longer and more severe life of excessive hot air waves, the limits of this method have been moved again. Because Steadman’s model was not designed to fully cover extreme hot and high humidity conditions seen today. [
The study of David Romps and Yi-Chuan Lu, researchers from the University of California Berkeley Campus, reveals that existing calculations are very hot and humidly felt temperature. The difference in some conditions according to the research can reach about 10 to 20 Fahrenheit (5 to 11 degrees Celsius).
For example, the air temperature is about 38 degrees Celsius, the relative humidity is 65 percent when the current calculation method is manifested by approximately 58 degrees Celsius, while the new model suggests that it can take up to 67 degrees Celsius. According to the researchers, this difference can give significant results when assessing the risk of excessive hotes on human health.

How does the change heat index make it more important?[ T27]
] Over hot weather events are now stand out not only with higher temperature values, but also with longer lasting hot waves and increased humidity rates. Therefore, understanding the actual temperature load exposed to the human body is becoming more important than ever.
The World Meteorology Organization and the World Health Organization emphasizes that excessive warms are one of the most serious climate-source health risks on the global scale. In particular, seniors, children, people with chronic disease, and outdoor workers have a greater risk due to high heat stress.
Therefore, many meteorology institutions are now using different indicators such as not only air temperature; heat index, Wet Thermometer Globe Temperature (WBGT) and HeatRisk. Because the temperature that appears in the thermometer to evaluate the effects of climate change is not enough alone. [email protected]
Thermometer no longer enough per single
Climate change not only increases average temperatures. It also makes hot air waves longer, more often and more humid. This significantly increases the heat stress exposed to the human body compared to the past.
The reason for re-evaluating the heat index of scientists is this change. The aim is not only to make a more accurate meteorological calculation, but to reveal the real effect of excessive hotes on human health.
In the coming years, we will not only be the temperature seen in the thermometer, but also more frequent the temperature and heat index. Because it is no longer enough to understand the effects of climate change. The actual risk lies in the heat load, which is formed together with temperature and humidity.