S.O. right now has about 3/4 mile visibility. Not pleasant but do-able. Weather channel does not have a fog alert so it is not severe.
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Just drove home down a surprisingly foggy Wyoming, and am trying to get a sense of whether the fog is localized or broader in scope.
(I need to decide whether to go forward with a trip out tonight which includes a good stretch of Parkway, and may bail if it is foggy at lower elevations.)