ADDS - Aviation Digital Data Service

ADDS - Prog Charts Help Page (1 of 1)
Back to Prog Charts Page
    The Prog Charts Page contains:
  • a list of time choices and thumbnails of each image. Click a thumbnail to enlarge it to full size.
  • Analysis data for the "latest analysis" chart is provided every 3 hours.
  • 12 and 24-hour forecast data are produced four times per day at approximately 0300, 0900, 1500, 2100 UTC.
  • 36 and 48-hour forecast data are produced twice daily at approximately 0600 and 1800 UTC.
  • These data consist of pressure centers and frontal positions provided by NCEP-HPC. Yellow dashed lines indicate troughs of low pressure.