The western basin does not have a well defined thermocline only if the water is deeper than 25 feet of so and than only for a short period during early summer. The average depth of the thermocline is 32 to 39 foot in the summer months so unless your fishing in waters deeper than the depth of the thermocline than dont even be concerned with it. Right now the walleyes are all over the water column so cover different depths and you should do well. As far as currents they change daily based on which way the wind and how hard it blew the day before but dont worry about that. Just turn your radio to channel 79 and listen abd we will tell you how to catch them