While inbound, the aircraft was seen to turn left while left of the localizer, and then right. The right turn continued into a spiral and resulted in a crash. A person who had flown with the pilot said that he sometimes turned the wrong way, and at times seemed to have difficulty in simply maintaining aircraft control. Aside from keeping instrument skills sharp, buy an approach-capable autopilot and turn it on. Four of those resulted in serious injuries or death.
Fog brings the lowest of all ceilings and the greatest unpredictability.
Unless you have a Boeing 777 that can land automatically and brake to a stop by itself on the runway centerline, don't mess with fog. A Beech King Air pilot tried his luck with fog at Olney, Illinois, in 1995 by descending below the minimum descent altitude while on a localizer approach. The pilot may have been lulled into thinking that the weather was better. Evansville had 1,200 feet scattered and 4,500 overcast with five miles' visibility. The King Air continued to descend after passing the airport until it struck the ground, killing the two people aboard.