Brrrrrrrrrr. We hope you’ve got some layers on this morning, D.C. It’s the coldest day so far this winter, with a predicted high of only 29 degrees. Sure, we were wishing for some proper winter weather for a while, but frankly this may be going just a bit too far. The bitter temperatures won’t last too long, though — Saturday’s high will be back up toward 50. Small Fire in Metro: We’re hearing there was…