Inside Prog Charts

Prognostic charts (progs) rank among the most used weather charts in aviation. Progs are published four times a day and provide a comprehensive overview of weather across the United States out to 24 hours. Theyre found many places, but the source is the NOAA Aviation Weather Center website under Forecasts > Prog Charts > Low Level. There is also a separate chart set under the Surface tab that ranges out to 8 days in the future, but there are no precipitation markings after 48 hours.

Key Takeaways:

• Prognostic charts require a three-dimensional understanding of weather systems like cold, warm, and stationary fronts to anticipate associated hazards such as icing, cloud layers, and precipitation patterns.
• Pilots must interpret various other systems—including pressure troughs, seasonal monsoons, and oceanic highs—to predict conditions like turbulence, VFR/IFR, and fog.
• Precipitation markings on prog charts are crucial indicators of air mass stability, distinguishing unstable air (showers/thunderstorms, turbulence) from stable air (rain/drizzle, reduced visibility).
• A comprehensive understanding of prog chart elements enhances a pilot's situational awareness, allowing them to anticipate weather developments beyond basic forecasts.

Key takeaways sponsored by Aviator Pro | Start Your Training ->

See a mistake? Contact us.