I'm no expert and even if I was this would still be a guess, but by looking at these charts it sure looks to me that LME Copper Warehouse Stocks have hit a peak and are getting ready to turn down again.
What does this mean to copper prices? Well the last peak was around Feb07 with copper prices at $2.50. In the following 5 months, the warehouse stock was halved and the copper price went to the $3.50s.
Currently the warehouse stocks are sitting right about where they were in Feb07 and the graph shows the copper stock with a nice rounded top forming (indicating that growth of the stock has slowing down bit by bit). An identical rounded top can be seen around Feb07.