Problem(s) Encountered:

I was blindsided by fog because the humidity sensor was evidently reading far too low.  We really need a reliable humidity gauge.

Solution:

Weather station PC was hung and not updating, or at least  not updating properly.  A full reboot corrected the humidity issue.  I did however also find that the wind speed never changed from 0mph.  Appeared to be a failed magnetic reed switch in the cup section of the unit (directionality of wind was still updating).  I ordered a new anemometer for the station but today found a spare in a cabinet so went ahead and swapped it out.  This one appears to be working.