Cirrocumulus lenticularis clouds in Monterrey, Nuevo León, Mexico, the day before there was a cold front, and a strong thunderstorm
<a href="//commons.wikimedia.org/wiki/User:Couch-scratching-cats" class="mw-redirect" title="User:Couch-scratching-cats">Couch-scratching-cats</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>