cumuli

Heaped white puffs

Cumuli is the plural of cumulus, the puffy, flat-bottomed clouds that pile up in fair weather.

Meteorologists use the Latin plural, though cumulus clouds or just cumulus works fine in ordinary speech: Cumuli were building over the mountains by midafternoon.

formation

altocumulus

Mid-altitude puffy formations

arcus · shelf cloud · updraft · convection · condensation · coalescence · thermals · billow · turret · cauliflower

appearance

pillowy

Soft and cushioned

fluffy · towering · mountainous · heaped · massed · domed · rounded · bulging · white · bright

weather

thunderstorm

Violent weather with lightning

downpour · lightning · hail · storm · fair-weather · instability · convective · humid · moisture · turbulence

sky

horizon

Apparent earth-sky meeting

scattered · broken · backdrop · skyscape · cloudscape · vista · panorama · altitude · soaring · gliding

Opposites
cloud morphology

cumulistratus

Low, flat cloud layer

cirrus clouds · cirrus · nimbostratus · altostratus · cirrostratus

Phrases
Family

accumulate, accumulation, cumulative, cumulus, accumulative, accumulator, cumulonimbus, stratocumulus, accumulatively

Familiarity
Top 1,000,000
Profile
Used worldwide · Timeless · Concrete · Rated G