I apparently arrived right after these successful birders, and it took until about 12:40 for the warbler to reappear. While I was searching the area, others arrived with half a dozen to finally a dozen birders looking without success until it showed again right where it was previously reported earlier in the day (as well as yesterday) -- north of McKenna building, inside the wooded area between Varsity Pond and University Avenue.
Stephen Saunders
Louisville, Boulder County