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Cadaver Dogs are a specialized air scent dog. As long as the scent is carried on the wind in their general direction, coming up out of the water or ground as they travel over it as decomp gasses, then they should detect it. If the remains are a distance away and the wind blowing in the wrong direction, probably not.
Getting the surface wind direction would be impossible. The winds shifted a lot during 4/21-4/22. There were periods of calm as well.

It would be possible that, it there was a body in the wooded or wetlands area across the river, the scent might not have reached the dog.
BTW, when I look at weather at the time, I check Weatherunderground here: http://www.wunderground.com/history/airport/KSEG/2013/12/21/DailyHistory.html