the stranger.
Fog and indeed TS can occur unexpectedly. You deal with it just like you've said.
The point is setting off to an area of known Fog or TS (in my opinion similar as they stand a good chance of improving within 30min) on min fuel is fool hardy. Especially like in this case to a busy Hub.
Fuel gives you time to gather information and make the safest and most commercially viable decision. It also gives you flexibility to change your decisions before you end up going deeper into your tunnel vision. Any pilot who has experienced options blinking out around them due to changing circumstances knows the value of this.
Putting yourself knowingly into a stress inducing scenario before even getting airborne is something that should be left to fighter jocks.