Unstable vs Stable
Cloud Basics

Cirrus
Nimbostratus
Cumulus

Often referred to as "puffy" or "cotton-candy like", cumulus are popcorn-like in shape often with flat bases. Although these are usually associated with fair weather, under unstable atmospheric conditions they can grow rapidly upward into thunderheads.
Towering Cumulus
Cumulonimbus
The Denver Brown Cloud

Afternoon Thunderstorms

What to Look for When the Sky is Partially Obscured

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