http://www.demotivateur.fr/images-buzz/6063/1%20catersnewsagency.jpg 1.Line of building towers flanking from a thunderstorm. http://www.demotivateur.fr/images-buzz/6063/2%20champanhecomtorresmo.jpg 2.Sun setting behind cumulus clouds. http://www.demotivateur.fr/images-buzz/6063/3%20allwomenstalk.jpg 3.Cloud to cloud to ground lightning. http://www.demotivateur.fr/images-buzz/6063/4%20Melissa%20Peterson.jpg 4.Mammatus "clouds boiling upside down", on top of a flanking down draft. Mammatus, also known as mammatocumulus (meaning "mammary cloud"), is a meteorological term applied to a cellular pattern of pouches hanging underneath the base of a cloud. http://www.demotivateur.fr/images-buzz/6063/5%20dramaticskies.jpg 5.Massive single cell severe tornadic thunderstorm. http://www.demotivateur.fr/images-buzz/6063/6%20duskyswondersite.jpg 6. Downdraft of precipitation from a young cumulonimbus cloud. The initial downrush happening as the rest of cell is still forming and building. http://www.demotivateur.fr/images-buzz/6063/7%20My7s.jpg 7.Leading edge of a flanking downdraft of a thunderstorm. http://www.demotivateur.fr/images-buzz/6063/8%20Debra%20Sheppard%20Cecen.jpg 8.Another great mammatus – extremely unstable air. http://www.demotivateur.fr/images-buzz/6063/9%20webneel.jpg 9.Sunset on dissipating thunderstorms. Could have two cells rotating in opposite directions, rare, but meteorologically possible, like two egg beaters. http://www.demotivateur.fr/images-buzz/6063/10%20arcreactions.jpg 10.Sunset dissipating thunderstorm. http://www.demotivateur.fr/images-buzz/6063/11%20National%20Geographic.jpg 11.Volcanic eruption creating a circular outflow boundary. http://www.demotivateur.fr/images-buzz/6063/12%20ponderation.jpg 12.Somewhat disorganized or dissipating thunderstorm. Most of it already downward collapsed with the rain shield being dominant. http://www.demotivateur.fr/images-buzz/6063/13%20karola84.jpg 13.Single cell thunderstorm with cloud to ground and cloud to cloud lightning, some being imbedded inside the cells. http://www.demotivateur.fr/images-buzz/6063/14%20scienceforums.jpg 14.Tornadic vortex w/lightning, multi-layer outflow boundaries. http://www.demotivateur.fr/images-buzz/6063/16%20Adlandpro%20Classifieds.jpg 15.Row of thunderstorms, and more beautiful cloud to cloud and cloud to ground lightning. http://www.demotivateur.fr/images-buzz/6063/17%20crossingislandnatur.jpg 16.Cloud to ground lightning in the rain shield in dissipating thunderstorms. http://www.demotivateur.fr/images-buzz/6063/18%20amazingsky.jpg 17.Single cell "super cell thunderstorm with mammatus. http://www.demotivateur.fr/images-buzz/6063/19%20crossingislandnatur.jpg 18.More great cloud to cloud and cloud to ground lightning. http://www.demotivateur.fr/images-buzz/6063/20%20Huffington%20Post.jpg 19.Tower cumulus building into a thunderstorm. http://www.demotivateur.fr/images-buzz/6063/21%20Only%20In%20Your%20State.jpg 20.A tornado funnel near the ground. Probably already on the ground, but not enough moisture or debris/dirt to see it on the ground. Surface dirt starting the kick up. http://www.demotivateur.fr/images-buzz/6063/22%20gparho.jpg 21.Circular outflow boundaries with storm cell rotation. http://www.demotivateur.fr/images-buzz/6063/23%20MindBlowingPicturejpg 22.Lowering wall cloud from mature thunderstorm. http://www.demotivateur.fr/images-buzz/6063/24%20crossingislandnatur.jpg 23.Lots of cloud to ground lightning (assuming the dark is mountains). http://www.demotivateur.fr/images-buzz/6063/25%20contabeis.jpg24.A large tornado on the ground.