HPC 24-h QPF Verification30+ years of deterministic forecasts

• Gridded verification system

  • until Dec. 1998, Polar Stereographic 30 km Grid with normalization
  • since Jan 1999, Lambert Conformal 32 km Grid with normalization for the CONUS land areas

• First Guess Analysis Field

  • 24-hour gauge-only precipitation observation on IBM SP
  • EMC Stage III analysis algorithm on 4 km grid remapped to 32 km grid
  • or CPC 0.25 degree analysis remapped to 32 km grid.

• HPC Manual Modification of First Guess using 240hr gauge observations

  • CPC data - HYD bulletins, STP Summaries, etc.
  • METAR & Syn OBS
  • CNRFC & NWRFC QC’d obs
  • Analyze 0.50, 1.00, 2.00”. Etc contours.

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