SA_Dec15_06HR
--December is the first month of meteorological summer in the Southern Hemisphere. --Most lightning over land is during the day. --The Andes usually provide a sharp western boundary in a NNW-SSE line and no lightning occurs over the cold water offshore of the Andes. --New thunderstorms often form over southern Brazil, move NE, then NW in a generally counter-clockwise pattern. --Storms at higher latitudes over Argentina generally move from a westerly direction. --The equatorial trough, also called the Intertropical Convergence Zone, is intermittent in an east-west alignment over the Atlantic Ocean westward from Africa. --The South Atlantic and South Pacific Oceans are nearly lightning-free except for a few storms over South America that extend to the east. ~Ron Holle
Jan 5, 2016 Webmaster Archive
--08 and 25 December: The farthest south lightning of the month occurs over and south of Ushuaia. --16 December: Frequent lightning is occurring farther south over Argentina compared with other times of the year. --16 and 27 December: The equatorial trough east of Brazil has a split structure. --28 to 30 December: Several long lines of lightning extend eastward over the South Atlantic. ~Ron Holle
Jan 7, 2016 7:48:30 PM Dave Fincher