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In the American Southwest, precipitation during the summer monsoon season provides a significant portion of the annual precipitation. Here lightning strikes over Southern Arizona's Tucson mountains during a 2010 monsoon thunderstorm.  Daniel Griffin/Unive (Image (c) In the American Southwest, precipitation during the summer monsoon season provides a significant portion of the annual precipitation. Here lightning strikes over Southern Arizona's Tucson mountains during a 2010 monsoon thunderstorm. Daniel Griffin/University of Arizona)