Lightning strikes, ferocious winds and torrential rain caused widespread damage and sparked chaos on the region's roads on 15 September.
The Met Office had reports of the weather producing "mini tornados" in and around Leeds as well as in Harrogate and Barnsley.
Firefighters in West Yorkshire took 90 weather-related calls in the space of just half-an-hour as a massive storm s
hook the region.
A fire service spokeswoman said it was the highest number of calls for help taken in such a short period of time by any fire brigade in 20 years.
Ranjit Dhanjan, of Cowper Mount, in Harehills, discovered part of his home's roof lying in the road as he returned from his pet shop around the corner.
He found his young children screaming in the family car which had been surrounded by the remains of the wooden guttering.
Mr Dhanjan said: "If I had come round the corner a little earlier the whole roof would have hit me. I was very, very lucky."
A Met Office spokesman said several parts of Yorkshire had seen more than half an inch of rain fall in the space of an hour – four times more than the amount which is considered a heavy downpour.
He said: "That is a torrential downpour. The conditions were ripe for mini tornados."
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