...FYI, it is 3° Celcius per 1000'
Where did you come up with that figure. Most PPL texts I've seen and the FAA Pilots Handbook of Aeronautical Knowledge use 2°C and 3.5°F per 1000' as a standard lapse rate. I am not trying to be aurgumentative, I have an interest in weather and try to absorb this stuff as best I can.
(I realize this thread is in the wrong place at this point...sorry for the hi-jack.)