Severe weather is developing across two primary areas of the country Monday afternoon and evening.
Mid-Atlantic states from New York City through Philadelphia and Washington D.C will see thunderstorms intensifying across the region bringing a threat for damaging wind gusts to 70 mph, hail, and flash flooding said AccuWearther.com Meteorologist Brian Edwards.
A second area of severe weather is located across the Midwest and Great Lakes from St. Louis, Missouri through Indianapolis, Indiana.
Edwards said thunderstorms intensifying along a cold front will bring a threat for damaging winds of 70 mph and hail to the size of golf balls.
UPDATES: All times listed in Eastern time
5:35 p.m. EDT:vMore than 4,000 U.S. flights have been delayed, and another 564 have been canceled, according to FlightStats.
5:31 p.m. EDT Monday:
Awesome pic of lightning right behind the US Capitol at 5:08pm during that nasty storm - from an @ABC News DC camera pic.twitter.com/DMPnoWmNdp— Karen Travers (@karentravers) July 14, 2014