Sudden Localized Surface Water Temperature Increase In Eastern Lake Superior, Canada As can be seen in the below sequence of NOAA images spanning 15 hours (most recent at top), in extreme eastern Lake Superior the surface water (but not bottom water) temperature increased dramatically in a localized area.  Can anyone confirm or rule out that this is a real event?  If it is real, what is the explanation?

Link to source and additional information (Additional information includes lake-bottom temperature maps and additional time points)
NOAA revised the data. 

The map below is for the same date and time as the first map in the question, but with the anomaly gone.  So I'll have to assume the event wasn't real.