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This map shows NLDN strike density overlaid on a topography map of the continental U.S. Lightning is an atmospheric phenomenon, and where it strikes is
a geological phenomenoni, tied to the resistivity and conductivity of the earth. The atmospheric effects are seen in Florida, where thunderstorms are generated offshore
and move onshore from both directions many days of the year. There are over 14 lightning strikes per square km per year in Florida. Similarly there are a large number
of thunder storms caused by cold air flowing down from Canada between the Rocky and Appalacian Mountains. Also note the difference in lightning strikes along
the Snake River Planes, where there are large volcanic flows, and note how few lightning strikes there are in the Mojave Desert in California. The key are the patterns.

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