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Welcome back. we are seeing weather extremes from coast to coast. much of the eastern and central u.s. is headed for the womanest christmas on record. but theres also a major storm brewing. severe weather threatening tens of millions of americans, and causing trouble for last-minute holiday travelers. nbcs miguel almaguer has details. >> reporter: the weather on i-49 along the texas/arkansas border turned the roadways deadly. three killed, seven injured in a blinding fog pileup. >> it sounded li...