MET Developments (CAA NZ CPL Meteorology)
MET developments
This domain tests awareness of how New Zealand aviation weather information is changing: new products, delivery methods and forecast technology, and the limitations that remain.
Current directions
- Graphical area forecasts (GRAFOR) present area-forecast information spatially, alongside or instead of text ARFOR. They are useful for route planning but must be read with the validity, level range and coverage stated on the product.
- Satellite and radar: high-resolution geostationary imagery (Himawari series) and dual-polarisation radar improve detection of convective cloud, heavy precipitation and volcanic-ash plumes. They are observations, not aerodrome forecasts.
- Numerical weather prediction and ensembles: higher-resolution NZ models and ensemble guidance improve timing and probability information, but TAFs and SIGMETs remain the authoritative coded products for flight planning.
- ICAO Annex 3 developments: space-weather advisories and revised SIGMET provisions add hazards that may affect HF communication and polar/high-latitude operations.
- Digital delivery: AIP New Zealand, online MetService briefing and electronic flight bags make amendments and graphical products easier to access; the latest amendment still supersedes earlier material.
Worked example
A GRAFOR shows a frontal cloud band over the lower South Island, while a destination TAF is still forecasting fine weather. Reason: the graphical product shows the spatial trend and the TAF is terminal-specific; the discrepancy is a prompt to check the issue times, the TAF's validity and any amended TAF or SIGMET. Do not discard the TAF, and do not treat the GRAFOR as an aerodrome observation.
Traps
Assuming a graphical product replaces the TAF; using an old AIP amendment; forgetting that satellite imagery is not a forecast; and treating ensemble probability as a coded TAF change group.