That white sign actually says something like "Welcome to South Dakota".

Nathan got a better picture. [Bigger]

Yes, the sun is still set, but it's not that dark yet. These cirrus clouds would be off to our south and west for as long as it was light enough to see them. They kind of looked like a distant thunderstorm. There were some flashes of lightning out there. When we finally got in for the night, the weather channel showed that these clouds were the blown-off top of a supercell thunderstorm well over 100 miles away in Nebraska. It sure is flat in this part of the country.
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