Low-level cloud classification aid

Top mostly with anvil; all forms of shower possible.

Upper part lacks sharp outlines; all forms of shower possible.

Flattened due to a stable layer or during afternoon.

Usually Cu base below Sc.

Defined cauliflower shape.

Ragged St or Cu below rain-bearing clouds; before, during, after precipitation.

Smooth, uniform layer or in ragged shreds when dissipating.

Rounded shapes with shading.

Very little vertical extent, can be frayed.