I don't know if the FSX weather data is accurate or not,but it does update  and constantly change during the flight. I would assume that the FSX is accurate to some degree since the FSX weather engine is supposed to link to real world Jeppeson weather data. I was planning on purchasing ASA. I still may do in the near future and report my findings.  I checked the FSUIPC log and you were correct,just a steady stream of fuel selector and anti-ice logs.