Have you ever seen a fully loaded B747C with a 100fpm rate of DESCENT after takeoff?? Since then we are probably one of the more conservative operators in relation to temperature inversions....
1: We involved the local MET people who provide forecasts, flight crews report actuals.
2: We only do it in the ME.
3: In our case there are no obstacles so we only account for CLIMB/FIELD.... BUT if there were obstacles we would account for them too.
4: MAA??? If its Minimum Acceleration Altitude, then the answer is no.
5: No lower or upper limit, if it is reported then its accounted for.
The highest that i have seen recorded was 18 degrees C.
Mutt