The tumbleweed then tried to roll off into the sunset, but due to the Old West's placement north of the subtropical ridge, the prevailing winds were in the wrong direction.

"Showdown", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

Alt Text

The tumbleweed then tried to roll off into the sunset, but due to the Old West's placement north of the subtropical ridge, the prevailing winds were in the wrong direction.