For what it is worth, I can tally both strong westward winds and strong eastward winds in Jeffrey City in September 2016:
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Interesting place if you know the history. I stayed there in 2000 at the JC Motel, which only took cash. That evening I ended up taking to a woman at the Split Rock about antelope meat and the collapse of the uranium mining industry, which is how the town came to be. She and her husband had moved there after the husband had been promised a job for life. Some of the abandoned, army-style housing barracks were still standing back then.