Freezing Fog in Frank Church Wilderness, Idaho

Freezing Fog December 20, 2020 · Frank Church Wilderness, Idaho

What the National Weather Service wrote

On December 20th dense freezing fog and freezing drizzle caused black ice to form on State Highway 75 between Idaho 21 and Squaw Canyon Road south of Clayton. It covered a 37 mile stretch from mile post 191 to mile post 218. All lanes were blocked and the road was closed by 6 am on the 20th.

Source: NOAA Storm Events Database, event 929721. Narratives are written by the National Weather Service forecast office that issued the report.

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