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Saw interesting temperature phenomena of Big-O this morning.(8/24/07) Found the edge of the upwelling on the southern shore and experienced big thermal changes. If you don’t have temperature probes, here’s what to look for:
An upwelling is when the cooler water from out deep in the lake is forced towards the shore & hence upwards. Actually, the winds blew the warm surface waters out deep, so the cold water on the bottom is displaced shoreward due to the increase in depth of the water column.
With this morning’s brisk South wind you could actually see the small waves on the colder shoreward side curling as they hit the warmer water.
Surface temp about 50 yds south (cold) of the boundary was 51.5F. Temp about same distance on the North (warm) was 64 F. I could actually feel turbulence against my aluminum hull in a couple places, just like one of those rides at Disney where the little boat you’re riding in is pushed through a canal by the water flow.
Off Russell, the edge of the upwelling was in about 150 FOW. Off the Genny, about 2 hours later, it was in at about 120 FOW.(Caught 3 staging Kings on the warmer side)
The same type surface texture changes can be seen in the spring warm-up period of the Big-O, however never as violent. i.e no wave curling. Typically the warmer water is the calmer water.
Tom B.
(LongLine)
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