I just finished up 2 days with Mark and Paul from the Bay Area.  Fishing was really tough for us yesterday.  It was really hard to get a grab on a nymph, and way too windy for any dry fly action.  Today was much better, and Paul landed a very nice 20 inch rainbow on a small mayfly nymph.  There are all sorts of bugs hatching mid-day.  Big and small caddis and a couple types of mayflies are thick during the warmest part of the day.  The fish seem to be keying on the mayfly nymphs, though.