HBB, next time watch what happens when you land and the wind drops and backs (assuming you are in the Northern Hemisphere) from 30kts to, say, 15kts in about 1500 ft! The aircraft will be all over the place in the windshear!!! Now, try that at FL350 with a 220 kt wind with appropriate windshear thrown in! Mmmmm, the coffee goes everywhere! Not much fun! If you suddenly fly into an updraught of +50 kts the Boundary Layer has nothing to do with it - you are in a "lift" plain and simple! You are going up - or down - at huge speeds! By the way, check out the texts on CB's! Avoid them as well if I were you! Alas, "windshear" and updraughts/downdraughs in CBs can cause significant damage! So, please, stay safe! And learn from others!
Cheers, H 'n' H!
PS Not patronising you in any way - just be aware that any change in windspeed, for whatever reason, can spoil your day.