Reply by Dave G

No matter how dry the climate is you have to limit how much material you remove then let the board re-acclimatize before continuing to remove. I try to limit to 20-25% reduction. This has the added advantage of actually leaving you some stock to re-joint.

Fortunately the kind of warp you describe is easier to tolerate than something out of square. Depending on what it’s used for I often ignore it and get good results. I would consider myself lucky on that particular board but they won’t all happen that way.

-- Dave, New England - “We are made to persist. that's how we find out who we are.” ― Tobias Wolff