Rescue centres in the central region are calling on cat owners to be responsible and get their animals neutered.
The advice comes as many shelters close their doors to the rising number of unwanted kittens.
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Heavy and thundery showers will die out in most places during the evening, but may continue near the Humber for most of the night.
Showers will slowly clear overnight. Any mist and low cloud will clear during the morning, leaving bright or sunny spells.
A man who once played for West Brom, Notts County and Lincoln has appeared in court over an alleged match-fixing conspiracy.