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English | Gaeilge

UCD School of Mathematics and Statistics

Teaching and Learning
2016 - 2017

The informal folklore related to the prediction of the weather suggests that the cumulus humilis clouds in this sky indicate a good day ahead. Such clouds show there is very little convection in the lower atmosphere, and the fact that it is well-formed indicates light winds at low levels. There is no cloud aloft, and thus no moisture or stable conditions or both. The cumulus congestus on the horizon suggests showers may be possible three or four hours from now, at the earliest, but chances are good it will remain a pleasant day through until the evening.
Picture: Denni Windrim
Licence: Creative Commons

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