Holes You Should Know About in Official WX Products

Few pilots know that FAA imposes a hard character limit on text products such as Convective SIGMETs and the Area Forecasts (FA). The Aviation Weather Center (AWC) has a check program for the Area Forecast that counts the number of characters. On busy weather days when these forecasters have a lot to mention in the forecast, they often bust the character count. This forces them to cut from either the text or the synopsis in order to make the size fit through the National Airspace Data Interchange Network (NADIN) hubs. Often the first casualty is the ellipsis (...). Forecasters can use two periods instead of three. Another casualty is the synopsis. Of course, the last resort is to cut from the text of the FA.

Key Takeaways:

• The FAA imposes an outdated 3000-character limit on aviation weather products like Convective SIGMETs and Area Forecasts via the NADIN system, a restriction originating from teletype days.
• This character limit often forces forecasters to omit details, such as synopses or critical text, potentially reducing the completeness of important weather information.
• AIRMET Zulu for icing is limited in scope, capturing only about 80% of pilot reports and frequently missing convective icing or non-widespread moderate icing conditions.

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