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It is not unusual for turnover to occur late in the year on bodies of water like Sammamish. Since the thermocline can form at deep levels, and since the lake has very little current and if the lake isn't exposed to heavy wind, it can take longer than normal for cooling surface layers to get the lake water to mix.
Although I have not been on Sammamish lately, I would expect this is what you experienced, Willie. I wrote a detailed article about this that can probably be found if you search on the internet, but I can't even remember which magazine it was published in.
ciao,
Marc Marcantonio
Posted by Tom Melowitz on September 7, 2019 at 2:45pm
Posted by Eric Urstad on April 3, 2019 at 7:38pm
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