The "supercell" storm is a variety of thunderstorm more usually seen in the United States.
BBC News Leeds & West Yorkshire
A ban on household mixing is expected to be announced today, according to Leeds City Council.
Council leader Judith Blake says she believes Leeds will be made an "area of intervention" as coronavirus cases rise.
That means "more household restrictions along the lines of those already in force across three of the West Yorkshire districts in Bradford, Kirkless and Calderdale," she says.
The rules are expected to change from midnight, Ms Blake adds.
A ban on households in Leeds mixing is expected to be announced later as coronavirus infections in the city continue to rise, the BBC understands.
It would mean people are not allowed to go inside others' homes or gardens.
It would be same rules as those already in place in Bradford, Calderdale and Kirklees.
- People will not be allowed to meet people they do not live with inside a private home or garden, except where they have formed a support bubble
- People will not be allowed to visit someone else's home or garden, even if they live outside Bradford, Kirklees or Calderdale
- People being strongly advised not to socialise with others they do not live with in other indoor public venues - such as pubs, restaurants, cafes, shops, places of worship, community centres, leisure and entertainment venues, or visitor attractions
- People will not be allowed to socialise outdoors in a group of no more than six people from different households
- People will not be allowed to visit friends or family in care homes, other than in exceptional circumstances. Care homes should restrict visits to these circumstances
Leeds City Council had asked for meetings in gardens to be allowed - but the authority is expecting the new rules to ban this.
The government is expected to announce new restrictions later.