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Fog is made of water vapor, yet sometimes ice particles can create the ephemeral mistWhen the air temperature is below freezing and relative humidity is greater than 100 percent—an infrequent combination—these ice crystals can form and hover to form a “pogonip,” or ice fog.

Hoping to add our own pin to Rugg’s map of Bigfoot sightings, we charted a course for Pogonip Open Space Preserve.

The outdoors seeming like the safest place to meet because of the pandemic, more walks followed, including along Twin Lakes State Beach in Santa Cruz and through Pogonip, a local park with a network of trails.