Heat health alerts have come into force across most of England as the country braces for a second summer heatwave.
An amber alert is in place for East Midlands, south-east, south-west, east and London.
The UK Health Security Agency (UKHSA) has warned health services and all UK residents could be affected by the heat.
The mercury is tipped to surge to around 30°C this weekend amid Glastonbury Festival, and it is forecast to peak at between 33C and 35°C on Monday when Wimbledon starts – making it the hottest day of the year so far.
And the blisteringly hot day will feel like 37°C due to the so-called ‘feels like’ temperature which is usually a few degrees hotter than official warmth. The i Paper explains what this is and how it is worked out.
The feels like temperature refers to how hot our bodies feel compared to the environment.
It varies from the air temperature because it takes into account other weather factors like wind, humidity, and cloudiness.
It also takes into consideration how heat is lost from the human body during cold and windy days.
Feels like temperature is used by most forecasters such as the Met Office because it can provide a more accurate depiction of outdoor weather – and it can also help people prepare for time outdoors.
Caption: The mercury is tipped to soar to 35C but the ‘feels like’ temperature will be 37CCopyright: BBCHow is the feels like temperature worked out?
It is calculated based on various elements and meteorological data such as wind speed, relative humidity, dew point, and air temperature.
The feels like temperature measures the predicted air temperature, relative humidity and the strength of the wind at 5 feet.
The feels like forecast also takes into account factors such as high humidity, which can make the weather feel much hotter than its air temperature.
Forecasters do not use a strict formula or method to work out feels like temperature – and each normally have their own approach.
Another common weather term is the heat index, which means the same as feels like temperature.
The heat index describes the feels like temperature in the summer, while another term ‘wind chill’ is used in the winter and is used interchangeably with feels like temperature.
Wind chill differs from feels like temperature because it is only a specific calculation of how cold the air feels on exposed skin due to the cooling effect of wind.
There is no official definition of wind chill and definitions vary globally, dependent on how it is measured. the Met Office said.
In the UK, wind chill is worked out by the Joint Action Group for Temp Indices.
The group calculates wind chill by measuring how much heat is lost from a person’s bare face when they’re walking at 3mph.
A formula measure ‘feels like’ temperature using the air temperature.
The formula is adjusted by taking into consideration changes in wind chill when the temperature is low and the heat index when temperatures are higher.
When there are average temperatures, a combination of wind chill and heat index calculations are used to adjust the formula.
How to stay cool in hot weather
There are various steps you can take to stay cool in hot weather, such as having a hot shower because its regulate body temperature, healthy ageing specialist Dr Yassine Bendiabdallah, of Zen Healthcare, a holistic pharmacy in London said.
You can stop getting dehydrated by drinking a glass of water soon after waking and continue to drink it throughout the day, according to Boots superintendent pharmacist Claire Nevinson said.
She said: “Staying hydrated is vital on a warm day – to help ensure you do not overheat.”
Adults can also keep their skin protected in a heatwave by using a product with sun protection factor of 30 and above, while children should use one that is rated 50, Nevinson added.
Professor Tijion Esho, a doctor and wellness expert who founded the aesthetics clinic Cultskin, said that freezing your pillowcase for 10 minutes before going to bed will cool your body down.
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