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events. downtown des moines a ghost town. >> i can imagine that it's going to disrupt a lot of other people who are traveling and trying to get here. >> reporter: a sudden whiteout marking just one layer of this triple winter threat. maggie vespa, nbc news, des moines, iowa. >> all right. for more on all this, let's turn to al roker. al, what are the areas of greatest concern as we go into the night? >> lester, it's flooding and severe weather. 75 million people from new england down into the carolinas under watches and warning. tornado watches into this evening from florida all the way on up into virginia, and you can see wraparound snow now from green bay, chicago, all into burlington, vermont. and we've got the risk of 21 million people under severe weather for wind gusts of 75 miles per hour. strong tornadoes, ef-2 or stronger, nocturnal tornadoes, twice as deadly. we're watching that. heavy rain 1 to 3 inches as you get up into new england.