What is bad weather really in aviation? yesterday as i was watching over at a Aerodrome Meteorological station ,?

..., as a trainee, i observed a dense altostratus cloud tending to a nimbo stratus cloud, a stratus cloud of over 7 oktas accompanied by -RA and a FEW CB , so i thought this was bad weather enough to cancel any take off from the airfield but amazingly over commercial planes took off at that time ..!!? so... show more ..., as a trainee, i observed a dense altostratus cloud tending to a nimbo stratus cloud, a stratus cloud of over 7 oktas accompanied by -RA and a FEW CB , so i thought this was bad weather enough to cancel any take off from the airfield but amazingly over commercial planes took off at that time ..!!? so really whats bad weather in Aviation?
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