STOCKTON (CBS13) – An unusual cloud spotted in Stockton caused a storm on social media Friday afternoon.

Photos started flooding social media a little after 2 p.m. Many people characterized the event as a UFO, using hashtags like #alien, #weird and even going so far as saying the earth was due for an extraterrestrial invasion.

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But, in all actuality, the event was probably just a hole-punch cloud – much like one that caused a commotion across Northern California back in 2010.

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As the National Weather Service told CBS13 back then, the distinctive shape of the cloud was most likely caused by an airplane that disrupted the cloud formation.

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This unique kind of cloud is actually relatively frequent, officials say, but is usually only seen in colder climates than what we see in the valley.