Chinook arch over Calgary
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W.J. Becker, MD, T. Feasby, MD,
Calgary, Alberta, Canada
This phenomenon occurs when the warm dry chinook wind blows down from the Rocky Mountains, which can be seen in the background. Downtown Calgary is captured inside the chinook arch and the Calgary International Airport is in the foreground of the picture. The sky is clear over the mountains and the arch is formed by the edge of the cloud formation over the prairies. Chinook winds are a trigger for migraines.
Figure. Chinook arch over Calgary.
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