The fog is not everywhere, it is patchy, meaning that you will suddenly run into areas of very poor visibility. Most of the fog will be outta here by around 9 am. Here are a few visibility reports from official reporting stations based on 6 am observations:
1/4 mile Gadsden and Anniston
1/2 mile in Calera
1 mile in Huntsville
Between those cities, in open valleys and rural areas there will likely be more areas of dense fog. After the fog is gone, we face a very pleasant day!