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Features November 2015 Issue

Inside Prog Charts

Below: This Aviation Weather Center prognostic chart is analyzed in the article.

Inside Prog Charts

Prog charts are a staple for many pilots trying to understand the weather ahead. These busy charts provide a vast array of information beyond what many of us might recognize.

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. They’re 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.

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