I fished with Bill from Fresno on the Fall River today.  The rain stopped around 10:30am and the PMDs started coming off at the same time.  We had calm overcast weather and the PMD hatch was really thick.  By lunch time it was so thick it was really hard to keep your eyes glued to your fly.  Plenty of trout up to 18" were on the job.  We had great dry fly fishing until about 3pm when the wind came up.