Mammatus clouds are rounded pouch-like features hanging from the underside of a cloud, often beneath a thunderstorm anvil. They can look dramatic, but the pouches themselves are not a tornado and do not produce severe weather.
What the formations look like
A cluster of smooth or lumpy sacks descends from a broader cloud layer. Side lighting can make the shapes stand out sharply, especially as a storm moves away.
Why they appear
The processes involve complex small-scale sinking motions, moisture and temperature variations beneath a cloud layer. Several mechanisms may contribute, so a single simple explanation does not describe every case.
What they indicate
Mammatus are commonly associated with strong thunderstorms but also occur with non-severe systems. Their presence cannot confirm that a tornado will occur.
Safety near a storm
Treat thunder, lightning and official severe-weather warnings as the actionable signals. Photograph from shelter rather than lingering outside simply because the cloud looks unusual.
Frequently asked question
Are mammatus clouds a sign of a tornado?
No. They can accompany thunderstorms, but are not a reliable tornado prediction.
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