Severe Weather Headed East

Here we are again. An impending dangerous derecho, an unusual weather phenomenon following a line of storms, poses a threat Thursday to mid-Atlantic cities, including Philadelphia, Baltimore, and Washington, D.C. After hitting the Midwest and passing through Chicago, pictured at left, the large storm is shifting to the East. Heavy straight-line winds, flooding, and large hail are the main concerns, though the potential of a tornado is also looming. The National Weather Service has issued severe thunderstorm watches through Friday evening.