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The higher you get in the troposphere, the colder it gets. However, when you reach the stratosphere the temperature starts to increase. A warm parcel of air rising creates a cumulus cloud, and eventually turns into a cumulonimbus cloud, which is a rain/snow cloud. As the warm updraft relies on colder surrounding air for it to be buoyant, as it gets warmer again it is no longer buoyant and begins to flatten out at the base of the stratosphere, unable to rise any further. Evidence of this is shown at the top of the cloud, which appears flattened like a pancake or appearing like an anvil.

So it is this increase of temperature in the stratosphere which keeps rain and snow restricted to the troposphere.

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12y ago
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Q: What keeps clouds rain and snow restricted to the troposphere?
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