When fog is heavy I just stay on surface....kill the motors...and go to 1024 TC until it clears to at least moderate fog....of course I keep waiting to get rammed doing this ...but so far it hasn't happened. I
have been rammed trying to get within less than 400 yards of a target in heavy fog.
For me it is a waste of time and fuel to continue ops in heavy fog..... results not worth the effort. An exception would be when assigned to a fuel critical long range patrol grid. Then I keep going despite heavy fog and ignore all reported contacts en route.
Heavy precipitation and high winds are of no major concern.