well a 100 Kt/ even higher speeds are encountered in jet streams and often you have strong up/down drafts close to build ups.... why is this speed so important? after it is ground speed not aircraft speed... what have I got wrong?
1. There wasn't a forecast jetstream for hundreds of miles; the accident was close enough to being right over the equator;
2. An updraft/downdraft does not knock 100kts off your groundspeed.