We've lived in northern Virginia twelve years now. In that time, the Potomac River has completely frozen over only twice. The first time was in 2007, and the ice was flat and smooth.
The second time was in 2009, and the effect was quite different. The river looked like a huge train wreck of ice. The were shards and splinters of ice piled one upon the other.
Temperatures this week are not predicted to rise above freezing again until Sunday (it's 16 degrees now). Will it freeze over again? If so, what will it look like? Stay tuned, because I intend to find out.