"Jay Honeck" wrote in message
news:Njcyb.362928$Fm2.362681@attbi_s04...
Again, the air was smooth as glass, however. It's hard to envision an air
flow that could cause such severe wind shear, yet not also cause moderate
to
severe turbulence.

Never seen anything quite like it.

I did a few months ago when I was going to fly for breakfast to a nearby
airport. The wind at ground level was mild (5-10 or so) and I climbed
through some light turbulence to get to 1k agl where it was 'smooth as
glass'. I looked at my airspeed and it was reading normal (~90mph) but I
glanced at my GPS and it's showing 40mph ground speed. After deciding that
my GPS was actually working correctly, I did a 180 and headed back to my
home airport with the GPS reading 140mph ground speed. While in the pattern
for landing, I ran into the light turbulence again. About 20 feet above
touchdown, I hit the windshear! Came down a little bit hard when the
headwind quit...