a ragged, fragmented rain cloud; a nimbostratus or cumulonimbus cloud that has broken apart or lost its coherent structure.
From Latin fractus (broken) + nimbus (a rain cloud). Literally means 'broken rain-cloud,' describing precipitation clouds with irregular or fragmented appearance.
Fractonimbus is what the sky looks like after a thunderstorm begins falling apart—a transitional cloud type that forecasters watch because fractured storm clouds behave unpredictably.
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