On Sunday, July 23, 2017 at 1:45:38 PM UTC-4, firsys wrote:
Yesterday, close to my home field, after I had given up( 2500 ft cloudbase)
I noticed lennie like clouds lining up across the light NW wind.

I have flown thermal wave often in the past, but nothing in the last ten years.
Missed this one but probably too weak to use.

These systems can difficult to get into but extensive and rewarding if you can do it.

Has anyone any idea of the met conditions for development of T.W?

Here are a couple:

Weak convection in the lower layer with light winds.

An upper wind of 15+ kts above an inversion, rising with height.

But there must be something else or I would see this more frequently.

John Firth
Ottawa

Back in the early 80's my friend Bennie Flowers and I flew a Florida wave on three different occasions. The wave took us well offshore south of Miami and we could have easily landed in the Bahamas. There was an article written for Soaring Magazine which depicted photos of the clouds. Since that time I have seem that same type cloud formation only a couple of times. As I recall the cloud base was about 2500 feet and we flew between the row of clouds and started going up like a homesick angel. Wish I could find those same conditions again. Bob