Question for met. experts
I was in a window seat on a flight out of LHR last Tuesday morning. London was covered in fog. It was a lovely sight from the air, seeing all the tall tower tops - Telecom Tower, the "gherkin", Canary Wharf, peeking out of the tops of the clouds. One thing that puzzled me was that the entire Hyde Park, and the area 1/2 mile all around it, was completely clear. Everywhere else was 100% covered in fog. What was so special about Hyde Park that caused this hole in the fog layer?