4 mph groundspeed

[C5Engineer 1170]

Fun times in a smooth but stiff wind. Was dead calm on the ground and blowing 40 at 500ft.

[EDMO 1078]

I don't think it was recorded when some pilot flew backwards at 3000 feet altitude for the length of a 2600 ft runway in a 150.  ;<)  EDMO 

[marksires 484]

I've seen a banner tower 'hovering' over St. Petersburg Florida in a Super Cub.  Was pretty cool to watch.

[nlappos 413]

We see some conditions like that in flight test in Florida, where the flat country can allow strong winds at 300 feet but virtually nil at the surface, up until about 2 hours after sunrise, when the local heating makes some lifting of the local air and mixing. We use a balloon rig to lift some pitots up to 300 feet and measure the winds at 0, 100, 200 and 300 feet. We can get 20 knots at 300 feet sometimes, 15 lots of time, and very close to zero at the surface. It happens especially when local winds are very low, and the wind is mostly a "land breeze" or "sea breeze" caused by land mass cooling and heating.