"Ricky" wrote in message
...

You are flying a high performance single recip. about two hours south
to an airshow you really, really want to go to. In fact, this airshow
is an annual thing you haven't missed in years.
You are not yet instrument rated but about halfway through the
training for commercial & instrument.

The enroute forecast is for heavy fog 20 miles south of your departure
airport to about 30 miles north of your destination. The fog layer top
is consistently 100-200 ft agl the whole way. Ceiling is nil and
visibility is 1/4 mile at best in the fog. Above the fog it is clear
blue with light winds the whole way. Destination is excellent VFR.
Conditions are forecast to remain this way for the duration of your
flight. Fog will be gone later in the morning but the destination
airport will be closed for the airshow by then. To make it to the
airshow in time you must fly over the fog for about an hour & 45
minutes (most of the way). The fog layer stretches 100 miles or more
both sides of your intended route, flying around it is unreasonable
and would compromise your fuel supply.

Go or No-Go?

What if it was something more important like a business meeting or a
critically ill close relative who may die within hours? How about two
engines instead of one?

Go or No-Go?

Ricky

The reason for the flight is irrelevant.

Personally I have never seen a 200 mile wide section of fog over dry land
where conditions were constant over the entire area, but even if such
conditions were possible the answer wouldn't be much different than if were
a body of water and you had no water survival gear. If you feel comfortable
flying a single engine plane over such a stretch, then go for it. Lots of
people do.