On April 20, 1952, the tankers Esso Suez and Esso Greensboro collided in dense fog, 200 miles south of Morgan City, LA. Both ships burst into flames while the Suez pulled away with a 20-foot bow gash. This month we end our traditional fog season in South Louisiana. In addition to the Mississippi River being relatively high, fog on the Big Muddy and along the coast creates problems for river pilots. Fog caused the worst aviation accident in history when two Boeing 747s collided on the runway in the Canary Islands in 1977, killing 582. The Andrea Doria foundered and sank, taking 51 lives on July 25, 1956 after colliding with the Stockholm in dense fog, 45 miles south of Nantucket Light.