When is it acceptable for pilots to file through WW Bulletins or Convective SIGMETS?

The acceptance of filing through WW Bulletins or Convective SIGMETs hinges on understanding the nature of weather phenomena that these bulletins represent. Convective SIGMETs indicate significant weather conditions such as thunderstorms, hail, severe turbulence, and low-level windshear, which can greatly affect flight safety.

When weather has not progressed as forecast, it may indicate that the severe conditions outlined in these advisories are less dangerous than initially predicted, which could lead pilots to believe that flying through these areas is manageable or safe. In such instances, a pilot may consider filing a route that takes them through a Convective SIGMET or similar advisory information, based on their assessment of the actual conditions versus the forecast.

Other choices do not align with the principle of operational safety. For instance, flying under visual flight rules typically requires weather conditions that are above specified minimums, making it unnecessary to file through alerts meant for potentially hazardous weather. Additionally, selecting a route simply because no better option is available or while at high altitude does not consider the critical safety implications associated with flying in areas indicated by Convective SIGMETs.