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Baseballs flew out of the ballpark in Colorado.
So. Experts decided that the high altitude and low humidity of Denver dried out the baseballs too much.
A humidor was built to store the baseballs and keep them from drying out.
Baseballs do not fly out of Safeco.
If they are stored in some random storage room, perhaps the low altitude and frequent rain of Seattle make the baseballs too moist.