Microburst?
Not in mid-air, this is almost certainly what is called "Clear Air Turbulence" (CAT) and is almost impossible to see. The best warning system for localized CAT is by other pilots reporting it. There are some forms of CAT found where a powerful wind is creating eddies on the fringes that can spiral down for some distance.
This is why no pilot wishing to grow old gets anywhere near a thunderstorm as it generates strong winds. I have been stuck at an airport for 6 hours when a gust front slowed down and just sat. Better on the ground than to have the playful winds disassembling your puny aircraft!
FYI: a Microburst is a ground-effect condition where the aircraft lift is adversely affected by a sudden wind at too low an airspeed to escape a stall. Like hitting a pothole and you hope the angels are on your side!