Noticeably cooler weather on the way tomorrow Details >
Mar 12, 2014; 6:29 AM ET A thunderstorm today
Airport and roadway delays are mounting as a snowstorm begins over the Midwest with its sights set on the Northeast later in the day.
Damaging thunderstorms will threaten North Carolina to the southeast Pennsylvania on Wednesday.
A spike in severe thunderstorms, capable of producing tornadoes, will follow a slow start to severe weather season in 2014.