I can confirm that on Thursday 1st March CWL was hit by fog. The Eastern Airways aircraft entered the Cardiff hold at 07:40 and diverted to bristol at 08:27.
Passengers were bussed to Cardiff and the outbound passengers were also bussed to Bristol to catch the flight.
I'm not 100% certain if the Met Office forecasted the fog but i know that on tv weather they appologised for not forecasting. The fog was very localised but very thick and two other flights were also diverted to Bristol.
The one thing i do know for certain that if the fog was forecast in the TAF/METAR then the crew would have planned for it as they would have had a weather pack for their first flight of the day.
Flight times and diversion information provided by
South Wales Aviation Group