the response for this query returned different to me, the Ambiguous Results case hits again.
Unfortunately KORF is at the same time
ICAO code for Norfolk International Airport /q/zmw:23501.4.99999
a russian rural town /q/zmw:00000.1.25954
and afaik we, as users, can't set a response priority or filter for results.
For a specific scenario, when projects are solely relying in ICAO codes, I was able to dig for a useful past post from Matthew Gregory, former WU employee http://apicommunity.wunderground.com/... . An (once again) undocumented prefix icao can be used to query for airport locations, so /q/icao:KORF.xml returns data from Norfolk, VA airport, avoiding disambiguations.