Hoar Frost?

What in the world is a hoar frost? Stop snickering. Did you wake up to a white winter wonderland this morning? There was a layer of frost covering almost everything in sight. The frost is known as hoar frost. It is absolutely beautiful. However, when you have a hoar frost always be on the lookout for slippery spots on the roads. Especially on bridges.

Hoar frost occurs when the temperature is below freezing and there is a lot of low-level moisture. This was evident with the fog that we had this morning in most areas. The moisture attached to just about everything in sight. The process of hoar frost occurs when there is a high level of water vapor that goes directly from a gas to a solid. It is not the same as ice. It is not liquid before it freezes. The process of going direcly from vapor to solid is called deposition.


The three pictures above are examples of the hoar frost from this morning. I want to thank the National Weather Service for top two pictures and our weather watcher, Chuck from Oshkosh for the pine tree picture.

As for the forecast, our temperatures are staying mild all week. Fog is possible again tonight especially inland. Hoar frost is possible again tonight. A little light rain is possible on Thursday night and Friday morning, but it looks quite light. Sunday looks to bring a stronger storm that may have both rain and snow for us. Stay tuned. Thanks for reading.

Mark Baden


5 Responses

  1. Yikes…looks like a storm on/around the 24th. Maybe a bit of lake enhanced top end snow for Milwaukee. Still early, but certainly a storm indeed.

  2. Temps for that storm will be interesting. Looks wet first before white. Thanks for the note.


  3. Hoar frost… I didn’t snicker, and you can’t prove otherwise.

  4. Maybe not a snicker, but a small chuckle.


  5. More like a snort, then a childish giggle. x)

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