Planks (a light wood?) that make up the top of a small table are weather
warped. "Cupped" upward.

This isn't meant to be a centerpiece of the home, but it would be nice to
make it presentable again.

What's the usual repair recommended for such a condition?

Tools available: the usual drills and hand tools; table saw; router; belt
sander; palm sander; paint gun and compressor.

Suggestions welcome.

Thanks.