At 11 p.m. central Monday night, a blanket of fog rolled into Dallas and grew thicker and thicker throughout the night.  Between 4 a.m. and 11 a.m. Tuesday morning, visibility hovered below a quarter mile – and dropped to near zero for several hours.


Weather observations in Dallas between 11 p.m. Monday night and 12 p.m. Tuesday CT. Hours during which the visibility fell below one mile boxed in red. (National Weather Service, adapted by CWG)

Via USA Today: “WFAA-TV in Dallas reports that a ground stop was issued for flights coming to DFW Tuesday morning and close to 50 departure flights were canceled by 10 a.m. About 40 inbound flights were diverted to other airports to wait out the fog.”

The fog formed as low level moisture oozed into the region from the southwest at the same time high pressure established itself to the north.  The high pressure area both kept the winds calm – holding the fog in pace, and stimulated cooling of the low level air, which allowed the fog to form in the first place.


Dallas in fog (Justin Terveen via Flickr)

Check out these photos, compiled via Twitter, of the Big D completely consumed by a memorable episode of blinding fog:


Dallas in fog, December 9, 2014. ( YouTube-Mike Prendergast )