Alphabetical List WMO Tropospheric Species
- Castellanus – castle-like with a series of turret shapes – indicates air mass instability.
- Congestus – great verticsal development and heaped into cauliflower shapes – indicates considerable airmass instability and strong upcurrents.
- Fibratus – thin filament type clouds, can be straight or slightly curved.
- Floccus – looking like a tuft of wool – indicates some mid and/or high level instability.
- Fractus – irregular shredded appearance – forms in precipitation and/or gusty winds.
- Humilis – small, low, flattened cumulus – indicates relatively slight airmass instability.
- Lenticularis – having a lens-like appearance – formed by standing waves of wind passing over mountains or hills.
- Mediocris – medium size cumulus with bulges at the top – indicates moderate instability and upcurrents.
- Nebulosus – indistinct cloud without features – indicates light wind if any and stable air mass.
- Spissatus – thick cirrus with a grey appearance – indicates some upward movement of air in the upper troposphere.
- Stratiformis – horizontal cloud sheet of flattened cumuliform cloud – indicates very slight airmass instability.
- Uncinus – cirrus with a hook shape at the top – indicates a nearby backside of a weather system.
Read more about this topic: Cloud Types
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