Here are the two severe thunderstorm watches (primary threat = damaging winds) in effect until 8pm EDT.
There are already significant or major delays at O'Hare, Newark, JFK, LaGuardia, Philadelphia, and San Francisco (due to low clouds and fog). There were earlier significant delays at Minneapolis and Detroit and may still be reverberating because of those delays.
Additional delays are likely.
Here is the AccuWeather Regional Radar form 12:50pm EDT. More thunderstorms are developing at this time.