2:15 PM: A line of thunderstorms with frequent lightning is moving into the far western suburbs, now approaching western Frederick, Loudoun and Fauquier counties. This batch will move through the metro area from west to east over the next couple hours.
A Tornado Watch is in effect until 8 p.m., which means conditions are favorable for the development of tornadoes and severe thunderstorms. The Storm Prediction Center says hail to 2 inches in diameter, thunderstorm wind gusts to 70 mph, and dangerous lightning are possible. The most likely timing for severe storms in the metro area is between 3 p.m. and 6 p.m. -- although storms may continue after that time.