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Lightning Animations (492 videos)


--April is the middle month of meteorological autumn in the Southern Hemisphere. --Most lightning over land is during the day. --The Andes provide a sharp western boundary in a NNW-SSE line and no lightning occurs over the cold water offshore of the Andes. --The equatorial trough, also called the Intertropical Convergence Zone, is intermittent in an east-west alignment over the western Atlantic Ocean and better defined in the Eastern Pacific. --Daily thunderstorms over Brazil often have a weak counter-clockwise pattern but individual storms do not travel far. --Thunderstorm activity over the southeast half of Brazil weakens during the course of April. --The South Atlantic and South Pacific Oceans away from the continent are nearly lightning-free. ~Ron Holle

May 4, 2016 Webmaster Archive

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--02 to 12 April: The equatorial trough has a double east-west structure over the Eastern Pacific. --15 to 16 April: Storms from Argentina extend far to the east over the Atlantic. --21 to 26 April: Storms from Paraguay and Brazil extend far to the east over the Atlantic. --25 to 29 April: Dry air moves south to north and suppresses all lightning across South America except the northern portion. ~Ron Holle

May 6, 2016 8:05:19 PM Dave Fincher