Buoy water temperature drops

Has anybody got any thoughts about the sudden drops in water temperature shown on 42012 and 42040?

42012 dropped about 5 degrees on Sunday and then yesterday (Monday) 42040 dropped 4 degrees.

If nobody is "adjusting" the instruments then I guess it's just a blob of cold water, but it sure seems odd.

The sea temp map at Johns Hopkins does show an unusually sharp transition in temperatures in the area.

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