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Topic in Depth - Cloud Seeding (5)

This Topic in Depth is about cloud seeding, a type of weather modification in which substances, such as silver iodide or dry ice, are added to the air in order to produce changes in the weather.

Cloud seeding is most commonly used to increase precipitation, but may also be used to suppress certain weather patterns as well, such as hail and high winds. While there is some controversy about whether or not cloud seeding actually does produce more precipitation, it can be a highly useful tool for areas that have very arid conditions and need additional rainfall to help produce more viable crops and minimize drought-like conditions.

Cloud Physics: The Basics
This website from the Oklahoma Weather Modification Program encourages students to initiate a debate on the controversy surrounding the issue of inducing or enhancing precipitation. The exercise describes the two basic tenets of cloud seeding: the Static Phase Hypothesis and the Dynamic Phase Hypothesis. Also...

Cloud Seeding Frequently Asked Questions
This site is provided by North American Weather Consultants, Inc. The site briefly answers questions such as "when did application of modern cloud seeding technology begin?," "Is cloud seeding effective?," and "Do the commonly used seeding materials pose any direct health or environmental risks?"

Can China Control the Weather?
Here, HowStuffWorks explains cloud seeding and its environmental impacts within China. Author Jacob Silverman explains how the process occurs and the benefits and costs of this operation. The information is clearly explained and a gallery of images is also provided. This site should prove quite useful to anyone...

Weather Forecast Models
Weather Forecast Models from the NOAA, provides links to sites posting output from many of their numerical models. These models attempt to simulate the state of the atmosphere at various times in the future.

Created by Carl Wozniak, Clouds attempts to make the study of clouds and the processes of cloud formation more accessible for elementary and early secondary classroom study. The site accomplishes this by breaking information down into five sections, complemented by both descriptive text and relevant pictures. ...

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