Altocumulus clouds act as a visual cue for a changing weather pattern. DALLAS — Why do altocumulus clouds appear ahead of a strong cold front on warm days?

These clouds are called altocumulus floccus clouds. The tentacle-looking streaks are ice crystals falling from the cloud but evaporate before they reach the ground, known as virga.

Rob Carlmark captured this image of altocumulus clouds filling the sky over Sacramento on Tuesday. While beautiful at the time, these clouds often foretell rainy days ahead, and in this case were ...

Now this is a cloud. Altocumulus floccus with virga also known as 'jellyticularus'. OK, we made up that last bit, but it really is sometimes known as a jellyfish cloud! Altocumulus is a middle ...

Altocumulus clouds are "mid-level clouds composed primarily of water droplets," according to the National Oceanic and Atmospheric Administration (NOAA). These groups of fleecy clouds share some ...

Lenticular clouds, scientifically known as altocumulus lenticularis, are stationary, lens-shaped clouds that typically form at high altitudes in the atmosphere.

Altocumulus clouds gave San Antonians quite the show on Wednesday.

This incredible cloud formed over Mount Etna earlier this week, spreading out across the Sicilian volcano like a velvety white pancake. The cloud is altocumulus standing lenticularis, Latin for ...