Definition
A prefix used in cloud classification to indicate clouds that are broken into ragged, fragmented, or shredded pieces by strong or shifting winds. Applied to certain low cloud types, it produces names such as fractostratus and fractocumulus.
Plain English
Fracto means the cloud is torn into ragged, irregular shreds rather than appearing as a smooth, continuous shape. It is a label added to a cloud's name to show that the cloud is broken up and wind-tattered.
Context Anchor
Seen in cloud descriptions such as ragged low clouds near an airport or beneath a larger cloud layer.
Derivation
From the Latin fractus, meaning 'broken' (the same root as 'fracture'). The name tells you directly what is happening to the cloud: it has been broken into pieces.
Why Pilots Care
Fracto clouds usually signal turbulent, unstable, or rapidly changing air. Ragged low clouds often appear ahead of or beneath weather fronts and storm cells, warning of gusty winds, reduced visibility, and bumpy flying conditions.
Grounding Statement
Picture a smooth sheet of cloud being torn into ragged scraps by gusty wind -- that tearing is what fracto describes.
Intuition Check
Fracto is not a separate cloud type by itself. It is a word part added to a cloud name to show that the cloud is ragged or broken.
Example Sentence 1
Beneath the approaching front, ragged fractostratus clouds drifted below the main cloud deck.
Example Sentence 2
Fracto clouds near the ridge warned of strong surface winds during the approach.