alto-cumulus

Alto-cumulus clouds drift across the afternoon sky.

Definition

1. Noun:
   • A type of cloud: "alto-cumulus" refers to a mid-altitude cloud formation characterized by white or gray patches, layers, or rounded masses, often arranged in rows or waves. It typically appears between 6,500 and 20,000 feet (2,000 to 6,000 meters) above ground.

Usage Examples

• (A mid-altitude cloud formation appearing as rounded patches.)
• (Clouds at a middle altitude that may affect flight conditions.)

Advanced Usage

• "Alto-cumulus stratiformis": a specific variety of alto-cumulus that appears as a continuous, flat layer.

  • The meteorologist noted the presence of alto-cumulus stratiformis, suggesting stable air aloft. (A layered form of alto-cumulus cloud.)

• "Alto-cumulus castellanus": a variety of alto-cumulus with turret-like protrusions, indicating instability.

  • Alto-cumulus castellanus often precedes thunderstorms. (Turret-shaped clouds that suggest potential severe weather.)

Variants and Related Words

• Altocumulus (n): an alternative spelling of "alto-cumulus," often used in modern meteorological texts.

  • Altocumulus clouds are common in spring and summer. (The same cloud type, spelled without a hyphen.)

• Cumulus (n): a low-altitude cloud type with flat bases and fluffy tops, from which "alto-cumulus" derives.

  • Cumulus clouds are much lower than alto-cumulus. (A lower-altitude cloud with a similar rounded shape.)

Synonyms

• Mid-level cloud: a general term for clouds at altitudes between 6,500 and 20,000 feet.

  • Alto-cumulus is a common type of mid-level cloud. (A cloud found in the middle layer of the atmosphere.)

• Patchy cloud: a descriptive term for clouds that appear in scattered patches, like alto-cumulus.

  • The forecast mentioned patchy cloud, likely referring to alto-cumulus. (Clouds that are not continuous.)

Phrasal Verbs

• Break up into alto-cumulus: to describe a cloud layer fragmenting into rounded patches.
  • The stratus clouds began to break up into alto-cumulus as the day warmed. (The cloud layer separated into mid-altitude patches.)

Related Idioms

• On cloud nine: a phrase unrelated to alto-cumulus, but sometimes used metaphorically for happiness.
  • She was on cloud nine after the good news. (Note: This idiom does not refer to the cloud type; it is a separate expression.)

Additional Notes

• "Alto-cumulus" is a compound word combining "alto-" (meaning high or mid-altitude, from Latin ) and "cumulus" (meaning heap or pile, from Latin ). It is used primarily in meteorology and aviation contexts.
• The hyphen is often omitted in modern usage, making "altocumulus" the standard spelling in technical literature.