Quick followup: apparently there is a little randomization occurring with the change window-i.e. it isn't always going to be 16 hours on the dot, but 16-18 hours I've found. Or perhaps 17 hours +/- 5% * 17 (or +/- an hour each way).' I also caught the beginning of a change-rain slacked off, then stopped, visibility improved from socked in to overcast, then about a hour later winds died down and it became partly cloudy.
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