Heat health warnings have come into force as Britain braces for its fifth heatwave of the year, with parts of the country set to reach a scorching 36C next week.Yellow heat health alerts have been issued by the UK Health Security Agency (UKHSA) from 9am on Saturday and will remain in place until 9pm on Tuesday, covering the East Midlands, West Midlands and South East. It comes as temperatures will climb across the country this weekend as heatwave conditions take hold, raising concerns over the potential impact of the hot weather on health and social care services.The Met Office have forecast highs of 30C on Saturday, before temperatures are set to rise into the low 30s across southern and south-east England on Sunday.The heat will then continue to build into early next week, with temperatures expected to reach 30C across England and Wales on Tuesday, and then climb between 32C to 34C by Wednesday.The heat will peak on Thursday, when parts of East Anglia and south-east England will see a scorching 36C.Mike Silverstone, Deputy Chief Forecaster at the Met Office, said a 'fairly widespread heatwave' is likely to move across large parts of England and Wales, causing 'hot conditions' to develop. He said: 'The heat is expected to peak for much of England, Wales, Northern Ireland and Scotland on Wednesday, with up to 34°C possible in parts of central and southern England and southeast Wales. Heat health warnings have come into force as Britain braces for its fifth heatwave of the year (Pictured: runners at Clapham Common Park, where the grass has been dried out by the sun)The heat will peak on Thursday, when parts of East Anglia and south-east England will see a scorching 36C Yellow heat health alerts have been issued from Saturday and will remain in place until Tuesday, covering the East Midlands, West Midlands and South East'East Anglia and south-east England, however, could see temperatures even higher on Thursday.' Mr Silverstone added humidity levels are also expected to increase as the week goes on - making conditions overnight uncomfortable. Next week’s heatwave comes as the UK has already recorded 33 days this year with temperatures exceeding 30C. The figure is just one day short of the 34-day record set in 1995, which could be broken in the coming days. The highest temperature of the year was a whopping 38C recorded at Lingwood in Norfolk on June 28.May and June's record-breaking heatwaves saw more than 2,800 excess deaths - and two more heatwaves in July fuelled droughts and wildfires across the UK. Major blazes have broken out across recent weeks, including at Dunwich Heath in Suffolk, Headon Warren on the Isle of Wight, Llanwonno in the Rhondda Valleys in South Wales and the Cairngorms National Park in Scotland.The risk of fires is expected to reach its highest level on Sunday, with almost all of eastern and south-eastern England facing an ‘exceptional’ fire severity rating, according to the Fire Severity Index. Wildfires have broken out across recent weeks as a result of the heat, including in Colchester (pictured) A drone view shows scorched woodland near Dunwich after a coastal heathland blaze Photos show the scorched black earth left behind by the wildfire in the Rhondda this weekExceptional is the highest level on the scale.Reservoir storage in England has also dropped to 69 per cent, down from 72 per cent a week ago and nearly 12 percentage points below the long-term average for the time of year, the Environment Agency said on Friday.Storage stood at 85 per cent at the end of June, which was the average for that time of year, but has fallen steadily in recent weeks.Five reservoirs are now classed as having 'exceptionally low' levels after England and Wales saw their driest July since records began, the Met Office said.Nineteen counties across England recorded effectively no rainfall – 1mm or less – across the whole of the month.However, amid the rising temperatures, a dolphin delighted kayakers in Dorset after leaping from the sea.Paddlers off the coast of Weymouth were stunned when the dolphin suddenly burst from the water, soaring around 4ft into the air.Captured by Mark Flanders, who was on the Sea Kayak Dorset outing, the dolphin was lit by bright sunshine as the kayakers enjoyed some well earned respite from the 20C Dorset heat.