Atlantic_24hr_Sep_2014
--Thunderstorm movement is most frequently from E to W in the tropics, and W to E at middle latitudes. --The equatorial trough (Intertropical Convergence Zone) is intermittent between west Africa and South America. --Easterly (tropical) waves move off west Africa over Senegal and Guinea almost every day. Some waves survive a short distance into the Atlantic, and a few such as on the 9th and 28th, make it part way across the Atlantic. None of them result in tropical cyclones during September. --Storms form on most days over Florida, Cuba, Hispaniola, and the eastern shores of Central American countries. --Thunderstorms develop often in NE Argentina and Paraguay. --The Andes provide a sharp western boundary in a generally NNW-SSE line. --No lightning occurs over the cold water offshore of the Andes. --Almost no lightning occurs over the NE Brazil due to the convex shape of the coast. ~Ron Holle
Oct 1, 2014 Webmaster Archive
--September is the first month of meteorological autumn in the Northern Hemisphere, and of meteorological spring in the Southern Hemisphere. --02-04 and 07-08 September: Large areas of frequent lightning, most likely from mesoscale convective systems, move ENE from the Argentina-Paraguay border. --22-23 September: A major lightning enhancement occurs from Mexico’s Yucatan peninsula south to Central America, slowly moving west. ~Ron Holle
Oct 3, 2014 11:51:18 PM Dave Fincher