* Cumulus clouds are relatively isolated: They form when warm, moist air rises and cools, causing water vapor to condense. This process typically occurs in pockets of unstable air, resulting in individual clouds rather than continuous cloud cover.
* Cumulus clouds have limited horizontal extent: These clouds are often described as "puffy" or "cotton-like" because they are vertically developed but don't spread out very far horizontally. This means there are gaps between them where sunlight can shine through.
* The air between the clouds is dry: While the air that forms cumulus clouds is moist, the air between the clouds is generally drier. This is because the rising air that forms the clouds draws moisture away from the surrounding air.
* Cumulus clouds are dynamic: These clouds are constantly evolving, forming, dissipating, and moving. The spaces between them can change rapidly as the clouds shift and change shape.
In summary: The combination of isolated cloud formation, limited horizontal extent, dry surrounding air, and dynamic nature of cumulus clouds creates those striking blue sky gaps we often see.
