Video: When will US cool down?

>> more about that storm threat and relief. kelly cast joins us now.

>> reporter: millions of people sweating it out. from the midwest to now the east coa coast. you can see the area shaded in the darker orange that is dangerous heat to be hout doors make sure you stay hydrated. we have a cold front sagging to the south. new york city will get a cool wind cooling us back to average we are talking the mid 80s. severe weather a threat with that cool down. severe thunderstorm watches are in effect for the entire state of new jersey . right now philadelphia under a severe thunderstorm warning , dangerous lightening. this storm has a history of downing trees and power lines .

Source: http://video.msnbc.msn.com/nightly-news/48107225/

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