That’s because the sim doesn’t do a good job of rendering thunderstorms at all in live weather. everything looks ok at a distance and you can see the lines of weather on the map, but when you get up close everything disapears or turns into clouds that top out at 20k feet or lower like you said. Very unrealistic…it has been like this for years. Not sure they are working on thunderstorms anymore, but maybe one day it will improve.
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