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What causes fog to form on the pond during the fall? | Ponds & Lakes Q & A


Are other fish like my plecostomus as hardy over the winter as my koi?What causes fog to form on the pond during the fall?
Bella – Forks, WA

There are few better moments than when you look out at your pond early in the morning to be greeted by a shimmering frost covered landscape accented by that light silvery veil of mist floating just over the surface of your pond. While it may be getting too cold to go out and physically enjoy the water now, your pond has seemingly endless ways to keep you entertained and inspired. So, how is it that this fog comes to rest over your water body and is it a precursor to potential problems or is it all just smoke and mirrors?

As we all know, the air that surrounds us holds moisture in the form of water vapor. While it is not normally visible to the human eye you can definitely feel it on those sticky humid days. If you have ever left a cold drink out on one of those particular days you have seen how this water vapor gathers on the outside of the glass giving the appearance that the beverage is sweating. This gathering, or condensation, of water vapor creates the appearance of fog over your pond in colder temperatures. In the morning, while the ambient air is cold, the evaporated water wicked from the warmer surface your pond condenses in that cool pocket of air to the point that you can see it. As time progresses the sun rises and the ambient air temperatures begin to rise essentially eliminating the cold air above your pond and the fog it creates. Rest assured that the presence of fog above the surface of your pond is not an omen of bad pond health or trouble to come. Enjoy the beautiful scenery created by this mysterious looking mist and take comfort in the fact that even in the cold seasons your pond never fails to perform.

Pond Talk: Have you captured any breathtaking pond pictures involving fog? Share them with other bloggers or on our Facebook page.

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