What is this, England?

Geez. We just went out to the beach to get some sun.
Right when we got there, ........

(check out the St. Pete beach cam)

http://www.baynews9.com/Sky9.html

[Sean B]

Geez...reminds me of the smoke that the brush fires brought us a little while back.

Ya'. It was interesting. It rolled in within about 20 minutes.
It went from nice and sunny to fog central. People started leaving once they realized they couldn't see. I couldn't see a boat that was literally hanging out right next to the shore. We also heard lots of single "hoooonnnnk" from boats not wanting to collide. Hopefully tomorrow won't be like that if it blows.

[BigR]

easy explanation:

water is cold, warm humid air comes rolling in from the south.
Voila!
huge condensation where the two changes in temperatures meet in the form of fog!