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Weather change from heat to rain brings flood warning Weather change from heat to rain brings thunder and lightning
(about 14 hours later)
Weather forecasters are warning of a dramatic break in the current heatwave with heavy rain overnight and early on Tuesday bringing flash floods. Thunderstorms and heavy rain seen overnight in parts of Wales have largely eased as the weather system moves across to England.
Isolated thunderstorms are expected to hit parts of north east Wales on Monday evening with downpours likely to make driving conditions difficult. The prolonged dry spell came to an end in the early hours, with forecasters warning of a risk of flash floods as rain fell on baked ground.
Showers will spread across Wales overnight and the heat will trigger more thunderstorms in the morning. Forecasters said there was still a risk of isolated showers and lightning strikes in north east Wales.
It is likely to remain humid though temperatures will be slightly lower. It is likely to remain humid but with lower temperatures than on Monday.
The Met Office has issued a rain warning for England, Wales and southern Scotland. On Monday, the Met Office issued a rain warning for England, Wales and southern Scotland.
The yellow alert covering most of Wales, apart from the far west and Pembrokeshire, is issued to give people notice that there may be disruptive storms. The yellow alert, which covered most of Wales apart from the far west and Pembrokeshire, is issued to give people notice that there may be disruptive storms.
The first of the downpours are expected to arrive in the next few hours in parts of north east Wales. Natural Resources Wales said heavy rain was likely to cause roads to flood and drains, ditches and small streams to overflow.
The sun-hardened ground is likely to make it easier for rain water to run off into drainage systems more quickly.
People travelling home from work or events like the Royal Welsh Show in Builth Well, Powys, are being advised to be prepared for the change to wet road conditions.
Natural Resources Wales said heavy rain is likely to cause roads to flood and drains, ditches and small streams to overflow.
In a statement, it said: "Those who are camping or caravanning should also keep an eye on the weather conditions and listen to advice from the site owners."In a statement, it said: "Those who are camping or caravanning should also keep an eye on the weather conditions and listen to advice from the site owners."
BBC Wales weather presenter Behnaz Akhgar said the first downpours would be replaced overnight by extended showers moving up from the south into the north and east. BBC Wales weather presenter Behnaz Akhgar said: "The worst of it is in England now. We had some thunderstorms overnight and lightning strikes over parts of south east Wales.
"These will intensify as the sun comes up. There is a risk of hail and thunder and some gusty winds. "The only place we could continue to have lightning strikes is north east Wales in the Wrexham area."
"The rain will fall heavily in some places, with the risk of localised flash flooding, but a couple of miles down the road there might not be anything. She said the risk of flash flooding was only likely in east or north east Wales where there could be some downpours.
"It will still feel warm but not as warm as it has been today. It will still be humid, perhaps even more humid than today." "The trend is for it to ease off by this afternoon."
Typically average temperatures in the shade on Tuesday would be 24C (75F) compared to around 28C (82F) on Monday. Typically average temperatures in the shade on Tuesday should be around 24C (75F) compared to around 28C (82F) on Monday.
The showers should disappear by later afternoon on Tuesday, leading to a settled period once again, she said.The showers should disappear by later afternoon on Tuesday, leading to a settled period once again, she said.
The UK has had its first prolonged heatwave since 2006 - though Saturday was the first day in seven when temperatures did not exceed 30C anywhere in the country.The UK has had its first prolonged heatwave since 2006 - though Saturday was the first day in seven when temperatures did not exceed 30C anywhere in the country.
However, it has not matched a heatwave in the summer of 1976, when temperatures above 32C (89.6) were recorded on 15 consecutive days.However, it has not matched a heatwave in the summer of 1976, when temperatures above 32C (89.6) were recorded on 15 consecutive days.