Shop Windows to the Universe

Arches National Park Geology Tour provides an extensive, visually rich description of the geology of Arches, by Deborah Ragland, Ph.D. See our DVD collection.
This photograph of stratus clouds was taken in San Giamano, Tuscany, Italy.
Click on image for full size
Courtesy of Sara Martin

Stratus

Stratus (weather symbol - St) clouds consist of water droplets and belong to the Low Cloud (surface-2000m up) group. They are uniform gray in color and can cover most or all of the sky. Stratus clouds can look like a fog that doesn't reach the ground.

Light mist or drizzle is sometimes associated with stratus clouds.


Last modified October 2, 2008 by Becca Hatheway.

Shop Windows to the Universe Science Store!

Cool It! is the new card game from the Union of Concerned Scientists that teaches kids about the choices we have when it comes to climate change—and how policy and technology decisions made today will matter. Cool It! is available in our online store.

Windows to the Universe Community

News

Opportunities

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

Low Clouds

The low cloud group consists of Stratus, Stratocumulus, and Nimbostratus clouds. Low clouds consist of water droplets. The base of a low cloud is from the surface to 2000m....more

Fog

Fog is a ground-level cloud. There are several ways that fog forms. It usually forms when moist air travels over cold land or water. The moist air cools down and the water vapor condenses and forms a cloud...more

Altocumulus

Altocumulus clouds (weather symbol - Ac), are made primarily of liquid water and have a thickness of 1 km. They are part of the Middle Cloud group (2000-7000m up). They are grayish-white with one part...more

Rain

Rain is precipitation that falls to the Earth in drops of 5mm or greater in diameter according to the US National Weather Service. Virga is rain that evaporates before reaching the ground. Raindrops form...more

Mist

It has been raining steadily for 4 days. There is so much moisture that clouds form down in the trees. I had heard of that in fairytales, but I've never seen it for real. It is really pretty! When the...more

Cloud Formation Due to Weather Fronts

Weather fronts can cause clouds to form. Fronts occur when two large masses of air collide at the Earth's surface. Warm fronts produce clouds when warm air replaces cold air by sliding above it. Many different...more

Drizzle

Drizzle is light precipitation that is made up of liquid water drops that are smaller than rain drops. Drizzle can be so light that only a millimeter of accumulation is measured at the Earth's surface....more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF