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August 2002

Delve deeper into hot topics featured in NGM’s August Geographica with help from Resources. Click on a link, pick up a periodical, browse through a book, and explore!
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Bolts From the Blue

A new composite map of satellite images now makes it possible to detect lightning activity around the world. Near-infrared optical sensors on two satellites detect changes in the tops of clouds. The changes, undetectable by the human eye, are translated into color codes that indicate the frequency of strikes. Black, red, and orange denote the most lightning strikes. Blue, violet, gray, and white reveal the least. (See map below.)

Web Links

Learning From Lightning
Discover how scientists are using satellites and lightning to better forecast deadly weather.

Global Hydrology and Climate Center
Follow scientists as they investigate the causes and effects of lightning and how it relates to thunderstorms.

Free World Map

Uman, Martin. All About Lightning. Dover Publications, 1986.

Yepsen, Roger. Lightning. Andrews McMeel Publications, 2000.

Lightning Map

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