The fog was so heavy at times, it was hard to see where you were going.
But on Sunday in Berks County, some faithful model airplane flyers came out to Drenkle Field in Mount Penn.
The fog was a bit disappointing but they say it's better than wind. and luckily the planes are tied to a line so they won't lose them in the fog.
These guys are part of the Flying Dutchman club- which is one of the oldest clubs on the East Coast.
It started in 1937. and this is the usual gathering every Sunday..