This footage shows a 'dust devil' caught on video in a British field

This footage shows a 'dust devil' caught on video in a British field. The mini whirlwind whipped up hay and grass in front of a passer-by in Cornwall. Peter Nankivell, from Silverwell, noticed the phenomenon while at home and rushed to get footage. So-called 'dust devils' occur in dry and hot weather, according to the MET office.