http://www.boston.com/news/local/massachusetts/articles/2009/08/12/fog_bank_adds_an_air_of_mystery_to_a_boston_afternoon/
Unusual lol,I know for a fact I'd have been waiting for something to emerge.
Stephan King wrote a story about it, and he told it stick with you kind of creepy, and let me tell you it stuck.
Fog in the afternoon may seem odd, but there’s a scientific explanation.
The morning fog we’re used to is called “radiation fog.’’ At night the temperature drops and the earth is giving off energy. As the temperature reaches the dew point, fog forms.
Yesterday’s fog was different. It is called “advection fog,’’ and it forms over an already cool surface like water and is gradually carried inland by the wind.