But what exactly does the warning mean, which parts of the UK does it cover and how hot could it get?
Here’s everything you need to know.
What is a yellow weather warning?
The Met Office issues three different weather warnings; yellow, amber and red. The color-coded system indicates the likelihood of the weather type, with red being the highest.
When a warning is given depends on two things; the effects that the weather may have and the likelihood of those effects occurring.
A yellow warning is issued when there is an increased likelihood of severe weather impacts that could potentially disrupt your plans.
This means the possibility of travel delays, road and rail closures, power outages and the potential danger to life and property.
The Met Office’s deputy chief meteorologist Dan Rudman said: “Thanks to ongoing high pressure over the UK, temperatures are set to rise by the day this week and an extreme heat warning has been issued.”
You can view weather alerts for today and the next six days on the Met Office website. The map also shows which areas of the UK are covered by alerts, so you can prepare to see if this affects your area.
Where in the UK does the yellow warning cover?
The yellow warning covers much of the southern half of England as well as parts of East Wales.
It also extends to Manchester.
how hot does it get
The heat will continue and intensify throughout the week, expected to peak on Friday 12 August and Saturday 13 August due to the impact of high pressure, the Met Office said.
Temperatures are likely to rise into the low to mid 30’s in the central and southern areas of the UK.
Temperatures are not expected to be as high as during the July heatwave, when historic temperatures of 40C were reached.
The Met Office said: “Away from the highest temperatures expected in central and southern areas, much of England and Wales and south-east Scotland could still see temperatures well into the high 20s with a chance of some spots with temperatures well into the low 30s.”
Temperatures are not expected to drop below the low 20s even at night in some areas in the south.
Tony Wardle, Met Office Deputy Chief Meteorologist, added: “heat wave criteria They are likely to be hit later this week for large areas of the UK, with the hottest areas expected in central and southern England and Wales on Friday and Saturday.
“Temperatures could reach peaks of 35°C or even 36°C on Saturday.”
How long will the yellow warning remain?
The yellow extreme heat warning is currently in effect between Wednesday 10th August and Sunday 14th August midnight.
It is advisable to check this again and again Met Office website for updated information as the Met Office regularly reviews its alerts and this may change as the weather forecast changes.
What is the impact of the yellow warning?
According to the Met Office, areas under the warning should expect:
- Individuals exposed to extreme heat are likely to experience adverse health effects
- The wider population is likely to experience some adverse health effects, including sunburn or heat exhaustion (dehydration, nausea, fatigue) and other heat-related illnesses
- Some changes in work practices and daily routines are likely to be required
- An increased likelihood of some heat-sensitive systems and equipment failing
- More people are likely to visit coastal areas, lakes, rivers and other beauty spots, resulting in increased risk of water security and fire-related incidents
- Some delays to road, rail and air travel are possible, leading to potential welfare issues for those affected by lengthy delays
How long does the heat wave last?
There is a chance of thunderstorms occurring next week but the temperature is expected to remain very hot.
The Met Office longer-term outlook for Saturday 13 August to Monday 22 August reads: “The start of this period will bring dry and sunny spells with very warm or hot temperatures for most. Meanwhile, regions in the far north and northwest may see cloud, patchy rain, and patchy coastal fog and mist with near-normal temperatures.
“Heavier showers may develop in the southwest and spread throughout the week, with some possible thunderstorms in the south. Temperatures remain above average but are trending downwards.
“This time of year sees more changeable weather, with many areas having the potential for heavier showers or thunderstorms with clear spells.
“Rainier conditions can generally be experienced in the north. Temperatures remain warm or very warm, possibly locally hot in southern areas. Towards the end of this period we may see a return to calmer conditions with dry and sunny weather.”