Back home, the Appalachian Mountains are no wider than 100-300 miles, no longer than 1500 miles and no taller than 6,683 feet above sea level, and the Great Lakes are five separate lakes totaling to an area of 94,250 square miles.
In this alternate scenario, the Appalachian Mountains are 14,505 feet above sea level, 65 to 300 feet wide and longer than 1500 miles, as presented below:
Alongside it, the entire Great Lakes Basin has been flooded off, turning the five Great Lakes into one Great Megalake.
Undoubtedly, a longer, taller Appalachian Mountains and a Great Megalake would turn cities like New York, Trenton and Boston into rainforests along the line of Seattle, but what about the Midwest? Would the changes put on those two major geological features alter the prairies of the central United States in any way? Would they be the key to reducing the danger zone that is Tornado Alley?