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Altocumulus lacunosus
Altocumulus stratiformis lacunosus cloud, next to altocumulus floccus
Abbreviation	Ac la
Symbol
Genus	alto-, meaning high, cumulo-, meaning heap, and lacunosus, meaning full of gaps
Variety	lacunosus (full of gaps)
Altitude	Above m (Above ft)
Appearance	Perforated with round, frayed holes
Precipitation	uncommon

Altocumulus lacunosus is a type of altocumulus cloud. The term lacunosus is from Latin, meaning "full of gaps". This type of cloud appears as holes present in an altocumulus cloud cover resembling a honeycomb. It is considered to be rare, since it is typically short-lived. Lacunosus cloud types (including this one) forms when a layer of cold air and a layer of warmer air come in contact with each other. This then causes the cold air to sink in the form of localized downdrafts. These downdrafts then strike through the cloud and create the holes.

References

1. "Lacunosus Cloud Variety: Perforated Holes | WhatsThisCloud". 13 November 2021. Archived from the original on 2021-11-13. Retrieved 13 November 2021.
2. "Cirrocumulus Lacunosus Cloud - EPOD - a service of USRA". 18 September 2020. Archived from the original on 2020-09-18. Retrieved 13 November 2021.
3. "Valuable Information About Altocumulus Clouds That's Worth a Read - Science Struck". 3 October 2020. Archived from the original on 2020-10-03. Retrieved 13 November 2021.

• Cumulus
• Clouds
• Cloud types