This is a photograph of cumulus clouds.
Click on image for full size
Courtesy of Carlye Calvin

Cumulus

Cumulus clouds belong to the Clouds with Vertical Growth group. They are puffy white or light gray clouds that look like floating cotton balls. Cumulus clouds have sharp outlines and a flat base. Seeing cumulus clouds in the sky can mean the weather will be good or bad.


Last modified May 21, 2009 by Becca Hatheway.

You might also be interested in:

Traveling Nitrogen Classroom Activity Kit

Check out our online store - minerals, fossils, books, activities, jewelry, and household items!...more

Clouds with Vertical Growth

Clouds with vertical growth include cumulus and cumulonimbus clouds. These clouds develop by warm air rising from the surface. They grow high up into the atmosphere rather than spreading out. Cumulus and...more

Cumulus Humilis Clouds

Cumulus clouds can be associated with good or bad weather. Cumulus humilis clouds are common in the summer and are associated with fair weather. They are usually widely spaced in the sky, have a flat base...more

Cumulus Congestus Clouds

Cumulus clouds can be associated with good or bad weather. Cumulus congestus clouds, also called towering cumulus, are in the last stage of development before becoming cumulonimbus clouds. The tops of...more

Nimbostratus

Nimbostratus clouds are part of the Low Cloud group. They are dark gray with a ragged base. Nimbostratus clouds produce rain or snow. Sometimes they cover the whole sky and you can't see the edges of...more

Finding Answers in the Clouds

Scientists are sending tiny airplanes buzzing in the sky to find out how air pollution can impact weather, climate, and global warming. The tiny airplanes look like regular planes but they have only a...more

Cloud Formation and Weather Fronts

Weather fronts can cause clouds to form. Fronts happen when two large masses of air collide into each other at the Earth's surface. Warm fronts produce clouds when warm air replaces cold air by sliding...more

Altocumulus

Altocumulus clouds are part of the Middle Cloud group. They are grayish-white with one part of the cloud darker than the other. Altocumulus clouds usually form in groups. Altocumulus clouds are about...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA