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Trees which then fall on local neighborhood power lines, or a more serious circumstance, sometimes we get freezing rain that can accumulate on transmission lines. when that happens, a lot more people can be affected by the outage. >> and how does it actually affect the grid itself? how does it become bigger than just that branch that may be iced up falling on a power line? >> if they get a transmission line that's taken out, it can actually bring generation plants off line. i'll give you an example. nuclear power plants need to be connected to a functioning grid so they can operate safely. we ...

The side roads are just horrible. >> reporter: roadways are covered in snow, making driving downright dangerous. new york governor andrew cuomo closed the long island expressway and the state's thruway south of albany after midnight as a precaution. we're waking up to an almost ear eerie sense of quiet here. that is the long island expressway. not a car on it. you can see the plows are out, they've been out all night. while they were preparing to take on this storm, they kept an eye on what's happened in the past. >> there's one thing we have learned from superstorm sandy is that we can never ...

Ongoing misas, by the way, is the council of elders that president karzai called together that recommended to him to go ahead with this. he should sign this. if we don't have an understanding here, we won't be able to go forward with the u.s. presence there. and there's a cascading effect that's really important to understand which is why it's so in the interest of the afghans. if the united states isn't there, the capability is no thereto to support nato and the other nations that want to provide support. it will impair our ability to continue to support the way we want to the afghan national...

>> ugly, wet conditions across metro atlanta. >> it could be one of the worst we have seen the last four or five years. it would really nail la guardia, jfk, philadelphia, newark. that's sort of the hub system that causes the cascading effect across the country. >> first time in a decade, we have halted the process of the iranian nuclear program and key parts will be rolled back. >> this is not a historic agreement. it is a historic mistake. it is not making the world a safer place. >> what adam was trying to do is come up with an act of revenge that would stab americans in the heart. >> the g...

For the holidays would be more difficult. >> ugly, wet conditions across metro atlanta. >> it could be one of the worst we have seen the last four or five years. it would really nail la guardia, jfk, philadelphia, newark. that's sort of the hub system that causes the cascading effect across the country. >> first time in a decade, we have halted the process of the iranian nuclear program and key parts will be rolled back. >> this is not a historic agreement. it is a historic mistake. it is not making the world a safer place. >> what adam was trying to do is come up with an act of revenge that w...