This doesn't even look real!
This is a new one on me! I saw DelphI's post about the tornadoes in Joplin Mo, (Missouri) and the pic she has up of the sky, and Researcher gave this link:
Researcher's link for Mammatus clouds (if you click on the pics on this link it takes you to other webpages with those pictures with more articles about them)
These are even stranger than the Asperatus Clouds!
Link for Google Asperatus clouds pics with links
EDITED TO ADD A LINK:
Cliff Mass Weather Blog Link
AND THIS EXPLANATION TOO:
Those are, in fact, Mammatus clouds and are harmless. However, they are usually (but not always) associated with strong thunderstorms. In this case, these clouds would be associated with the strong storms that rolled through NY earlier. Some research suggests that these clouds are more prominent after the storm has passed. They are not a reliable indicator of a potential tornado. They are formed because moist air is interacting with dry air, the temperature differences causes evaporation at different levels and thus...these pouches form.
Think of it this way...you have your car parked next to the empire state building and some yahoo decides to throw a bucket of change off the top of the building. The bucket has all kinds of coins...quarters, dimes, nickels, etc. When the change lands on your car you'll expect lots of dings...some smaller dings (pennies that landed) some larger dings (quarters that landed). In this scenario, your car would be the cloud, the coins are raindrops or ice crystals and the size of the coin represents the amount of energy required for evaporation. So, for the clouds...the more evaporation that is required, the larger the pouch. Just likein our car scenario, the larger the coin, the larger the ding in your car.