Norfolk Fire Service received a series of flooding-related calls following storms which brought with it torrential rain and thunder across the county.
The storms, which followed a Met Office yellow weather warning which will remain in place until 2am tomorrow, saw storms sweep through Norfolk resulting in flooding and lightning strikes which caused havoc to roads and rail in some parts.
A spokesman for Norfolk Fire and Rescue Service said they received somewhere in the region of 20 calls about the weather with most of the call outs to Hethersett, Wymondham, Great Yarmouth and Caister.
Meanwhile Norfolk police said although there had only been about five or six crashes as a result of the weather, there was 'lots of standing water everywhere' and urged motorists to take care.
Lightning struck across the county with Robert Kett Junior School in Wymondham evacuated and three fire crews were called to a property on Geoffrey Road in Lakenham due to a strike.
There have also been reports of flooding in Earlham and Hethersett.
Racing at Yarmouth was delayed by 30 minutes after a heavy thunderstorm caused disruption at the track.
After having staged the first race of the day, course officials were keen for the storm to pass in the interests of safety before racing could resume.
The going turned soft after 18 millimetres of rainfall within an hour.
Racing resumed at 2.50pm when Glorvina (8-11 favourite) won the one-mile seller.
Yarmouth executive director Glen Tubby said: 'We had a 30-minute delay on all races, but the track is raceable.
'We've had an extreme amount of rain in just under an hour.
'I don't think we've had as many thunderstorms one after another like this before. We must have had six or seven and that's quite exceptional.
'What I am pleased about is that it appears that the track, which is relative new, has handled the rain.'
The weather warning states: 'Thunderstorms will develop today before clearing by early Friday. While these storms may miss many places, where they do develop intense downpours are likely, bringing the threat of sudden flooding of roads, transport routes, homes and businesses. Lightning and hail may be additional hazards.'
Around 20mm of rain could fall in some places and Norfolk is set to the worst of the showers on Thursday night.
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