A "tornado" was filmed swirling through West Yorkshire skies on Monday evening (21 July).
Footage posted on social media in Marsden, near Huddersfield, showed a narrow tunnel of clouds stretching up towards the sky.
A tornado is a rapidly rotating column of air that reaches between the base of a storm cloud and the Earth's surface; they form as part of severe thunderstorms.
A spokesperson for the Met Office said: “It certainly looks like it could be a tornado but without seeing it touch the ground it isn't possible to confirm it isn't a funnel cloud. It is only a tornado if it touches the ground. The convective conditions were right for the formation of small scale tornadoes.
“Around 30 tornadoes a year are reported in the UK. These are typically small and short-lived, but can cause structural damage if they pass over built-up areas.”
