The prefix “alto” (meaning “high”) helps distinguish mid-level clouds from their lower-level counterparts (such as altostratus vs stratus). NWS cloud chart. Click to expand to full-size.

Clouds play an important role in regulating the climate. Bright ones at low altitudes generally reflect solar energy away, ...

Noctilucent cloud season is upon us! Here's what you need to know about when to catch the spectral phenomenon as we move into the prime viewing season of the summer months.