Hi Guys,
I found the time to upload Joe lecturing about Thermals and other related soaring stuff while visiting in Israel, and was super nice to lecture at my house in front of 25 of our F3K pilots.
This is Part one of many parts i'll uploads later.
This part contains:
1. Meteorology
2. The Playground
3. Typically daily cycle
a. The first low level thermals
b. Late morning mixing
c. Mid day conditions
d. Late afternoon conditions
e. Evening conditions

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Thermal Structure and Behavior
by Wayne M. Angevine

For impatient readers, here are the basics: Thermals are like fat trees, with small, chaotic
roots near the surface and large trunks above. The trees tilt and sway with the wind and change
with time, and sometimes they let go of their roots and drift. Between the trees is sinking air.
Where thermals form, their exact shape, and how fast they change is hard to predict, since it
depends on details of the interaction between the ground and the air. Key principles to
remember are:
Thermals are driven by temperature contrast between the ground and the air.
Air exists in parcels (blobs) that have mass and momentum as well as temperature and
humidity.
Plumes near the surface look and act different from thermals well above the surface.

Terms:
Anabatic: Upslope winds

Catabatic: Downslope winds

Lapse Rate: The rate of temperature decrease/increase with a change of altitude

Inversion: Normal lapse rate with an increase of altitude is lower temperature. An inversion is an increase of temperature with altitude

Thermal Structure and Behavior
by Wayne M. Angevine
Nine pages
http://www.rcsoaring.com/docs/thermal...

Joe Wurts lecturing about Thermals Part 1
https://www.youtube.com/edit?o=U&vide...

Joe Wurts lecturing about Thermals Part 2
   • Joe Wurts lecturing on how to find Th...  

Joe Wurts lecturing about Thermals Part 3
   • Joe Wurts lecturing on how to find Th...