'Straw-nado' spotted in a field
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'Straw-nado' spotted by police in Buntingford

A mini-tornado has been captured on video by police.

The "straw-nado" was spotted in Buntingford, Hertfordshire, by officers from East Herts Rural Police. They tweeted they had "never seen this before".

The force said the farmer was "upset" because the field was "now in a mess".

Dan Holley, from Weather Quest, said the sighting was actually a "dust devil".

"They form on calm and very warm days where there's quite a bit of sunshine to heat the air up, the air rising rapidly may start to spin if it encounters pockets of slightly cooler air," he said.

"Most are usually harmless and last a matter of minutes."