Picture in your mind a large ball of very cold air at an altitude of 10 to 15 thousand feet and drop it. It will fall straight down gaining speed as it falls.
When you are flying and hit this ball of air you can drop hundreds of feet as you (hopefully) fly through it.
Worse yet, when it hits the ground with a giant splat.
Winds at the center of the splat are near zero and very cold; BUT
Outwards from the center winds can reach a hundred or more miles per hour.
Flying close to the ground like on approach, an aircraft will encounter headwinds of a hundred plus miles per hour causing your indicated airspeed to increase rapidly and then decrease to near zero moments later as you exit the microburst with a hundred plus mile per hour tail wind causing a stall condition and most often a tragic fall to the ground.
Pilots are trained (as a direct result of the DFW crash) to recognize that unexplained increase in indicated airspeed coupled with a decrease in speed over the ground as the primary indicator that you have entered a microburst. The only way to save the plane is to recognize it is happening; advance power to maximum (afterburners if you got em), raise the nose and pray you caught it in time not to crash when you come out the other side.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW