TODAY   |  October 29, 2012

Why Sandy could be most dangerous hurricane

The combination of a winter-time jet stream, warm tropical air and a full moon is turning Sandy into a huge and complicated storm that has the potential to devastate the Northeast and parts of the Mid-Atlantic. TODAY's Matt Lauer reports.

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This content comes from Closed Captioning that was broadcast along with this program.

>> perfect storm used in the past and perhaps even too often but sandy really could fit the bill. it's all because of a rare convergence of events that will make the next couple of days unlike any the east coast has ever seen. windows have been boarded, store shelves cleared and residents evacuated.

>> if you refuse to evacuate, you're not only putting yourself at risk but also the first responders who will have to assist you.

>> scenes we normally see on the gulf coast instead brought to the northeast by an unusual and potentially devastating mix of ingredients, first hurricane sandy.

>> the rush to prepare for sandy is on.

>> second, her path. while storms moving up the coast typically drift out to sea, the jet stream is forcing sandy into an almost unheard ofeft turn

>> we've never seen this. this is unprecedented for a hurricane to take this kind of track.

>> and that rare turn points sandy not only towards 60 million people but yet another storm.

>> a northern storm combining with a hurricane to be a super storm . it's a hurricane in the middle and a nor'easter outside it.

>> frigid air from the north could bring up to two feet of snow, from kentucky, to virginia and north carolina .

>> the combination of this wintertime jet stream coming in and this tropical air coming up is to make more rain, more snow and a bigger storm with more energy in it.

>> yet another unlucky piece of the puzzle, a full moon bringing peak tides and making flooding all the more likely.

>> flooding is very real and serious concern for many families. i know that for those of you who have lived through this before, my words offer little comfort.

>> and one final factor. sandy's sluggish pace, crawling as slow as 15 miles per hour, meaning that the damage, danger and misery won't be going away any time soon. that's some image, the satellite image . by the way, throughout the morning we'll show you storm pictures that you share with us. if you've got a great storm photo tweet it to us using the #sandytoday.

>> a lot of anxiety this morning as we await impact of the storm. a lot of people have questions abouweather events. tweet or e-mail them to us as well. we'll try to answer some of those questions a bit later