Air colder than water equal fog. Im not an avid fisherman anymore, but i have been on both lay and Mitchell on extremely foggy mornings to the point i just dropped the trolling motor and fished from the ramp until it burned off, but you would hear boats coming speeding by running off there gps. I just dont understand that since the GPS doesnt show other boats or floating objects. Im surprised if fog was the issue and a causing factor that MLF didnt delay the launch. I think it was FLW/MLF several years ago had a boater die in bad weather conditions on Okeechobee.