There is not a master architect that designs the lumber market. All of the elements of the design exist, yet no one creates a single drawing. It is left to Lumber Traders to create the interpretation, much like an art.
This months elements of design:
2 OSB Mills have announced more curtailments and as a result mills move order files out to mid November. If you need it sooner, you are going to PAY more for it.
The Futures Market is up.
Labor force limitations result in slower build times. Slower build times result in less lumber demand.
Winter is around the corner. Less lumber moves in the winter weather.
Overall, the market continues to roll forward at an even symmetry and pace. Mills and end users continue to balance the supply and demand dance. Just in time buying appears to be the method of choice for buyers in the near term.