http://sacramento.cbslocal.com/2014/05/10/hole-punch-cloud-spotted-in-stockton/

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.

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.

California Skywatch is dedicated to watching the skies of California. Clouds, planes, contrails, UFO, and optical phenomena are what we are looking for.