Severe storms, called a derecho by meteorologists, moved through Chicago this morning. Ahead of the storm, people sighted a shelf cloud in Illinois.Shelf clouds often form at the leading edge of a gust front or outflow boundary from a thunderstorm, or strong winds
Extensive power outages in Washington, DC and Baltimore are visible in these images bellow posted by Earth Observatory on its website. Clouds obscure the lights of Philadelphia and other areas north and east of Baltimore. Of particular interest is the loss of light to
On June 29, 2012, a windstorm started in northwestern Indiana, and traveled more than 1,000 kilometers (600 miles) eastward across the Midwest and mid-Atlantic, cutting power to millions and killing thirteen people. More than 500 damaging wind reports were received
A derecho (from the Spanish adverb for “straight”) is a long-lived windstorm that forms in a straight line — unlike the swirling winds of a tornado — and is associated with what’s known as a bow echo, a line of severe thunderstorms. The term “derecho” was first
