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On the morning of 24 March 2017, there were some interesting fog / low stratus events in the West. In northeast Montana, we can see fog surging up the Milk River Valley in the GOES-16 visible imagery:
Saturated soil (due to snowmelt runoff flooding) from the Big Muddy Creek contributed to the fog event:
— NWS MBRFC (@NWSMBRFC) March 23, 2017
Meanwhile, at the same time in Arizona we see fog / low stratus sloshing back and forth (most likely in a canyon or valley) south of Sedona: