It would appear at the time of the charting, warmer water is offshore. With winds calming down, the Niagara flow may take the midwaters back overnight so what silverfox said may hold true. If you want to hunt before you fish, run out to 150', stay in neutral and watch the graph. Put you probe down and find the thermocline. Nothing on the graph?....cruise out to 250' and repeat. Nothing at 250'..... shoot out to 400' and set lines trolling North until you find fish.