Today, President Obama designated the Katahdin Woods and Waters National Monument in Maine to honor 100 years of the National Park Service. To date, the President has protected more land and water than any other president in history—commitments that will protect our land, water and wildlife for future generations: http://go.wh.gov/moysMZ
This photo shows a supercell thunderstorm that swept across west Texas a few years ago. The photo was taken near the town of Ballinger, where the storm dumped hail up to the size of tennis balls and produced strong winds that damaged trees and power poles.
A thunderstorm is classified as a supercell storm if it contains a persistent rotating updraft, or mesocyclone. Supercell storms are responsible for some of the most intense severe weather, including tornadoes, very large hail, damaging winds, and floods.