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Frazil ice, as you see here in a recent picture of the Hudson River, forms in turbulent rivers (and the ocean and sometimes lakes) when the air is below about 18 degrees F. The river water itself has to be a fraction of a degree below 32 F (super-cooled).

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Frazil ice | River Ramblings

For winter newcomers to the Upper Hudson, and you who have not read or understood my many attempts to explain this before: That brilliant white stuff that sometimes fills the Hudson from Thurman to The Glen is not snow, and has nothing to do with it.

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