The BBC Weather forecaster warned heavy showers will be particularly persistent in the north-west areas of the country where hail showers could also be expected. But Carol Kirkwood warned rain showers will be hitting most parts of the UK this week, adding flash flooding could be expected. She said: “There is a flood warning in parts of north-east England in force at the moment.
“And the forecast for the next few days is one of thundery heavy downpours and it’s also going to be warm and humid.
“But there will also be some sunshine in between.
“What we have this morning is what we had for the last few days, a lot of cloud.
“There’s going to be low cloud, some mist and also some fog.”
She added: “We have some showers already in the west, they will get going as we go though the course of the day.
“Some of them heavy, thundery downpours, also with some hail.”
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Yellow weather warnings for thunder from the Met Office were in place on Monday for Wales, Northern Ireland and North of England, with showers and lightning forecast to hit the warning areas.
And forecasters warn the dreadful weather will set a precedent for the rest of the week, with continued thundery downpours in store for the next few days.
Conditions over the weekend felt humid and warm, with highs of 25.5C at Santon Downham on Sunday, but cooler conditions and persistent low cloud and sea fog to the coasts of eastern England, and eastern Scotland.
The Met Office also warns there could be some damage to a few buildings and structures from lightning strikes.
There is also a good chance driving conditions will be affected by spray, standing water and/or hail, leading to longer journey times by car and bus.
Throughout the week, “temperatures will be consistently building and feeling rather mild for much of the UK but that isn’t the story for the weather this week”, Mr Claydon added.
Tuesday’s forecast is “a similar picture to Monday, with widespread showers reaching the east, with some occasional bright and warm patches.”
The Met Office forecaster added: “There will again be thundery, heavy showers with more cloud on Tuesday as the pattern continues.”
Wednesday will also follow the pattern of thick cloud, patchy sunshine and heavy showers, but Mr Claydon said “there will be a change overnight into Thursday.”
He added: “This is due to a band of rain heading across the south bringing persistent downpours into Thursday morning.
“However, they will peter out quite quickly and it will be drier on Thursday than the rest of the week.”