NCEP Central Operations (NCO) is responsible for producing the official NCEP Model
Verification output. The NCEP Verification processing is broken down into daily and monthly
statistics.
The daily and monthly verification processing is broken down into three main programs:
QCMON, SUMAC4 and ANLVER. The QCMON monthly processing produces reports of aircraft;
AMDAT/ASDAR; ACARS; satellite wind; ship-based radiosonde observations; and, radiosonde
observations of geopotential height and wind using daily statistics from the gdas1
prepbufr files at 00Z; 06Z; 12Z; and, 18Z.
The SUMAC4 programs are set up to verify gridded forecast fields against quality-
controlled radiosondes. Program sumac4 verifies the GFS; NAM; and, UKMET model forecasts
of height; temperature; relative humidity; and wind at 850MB; 500MB; 250MB; and 100MB
against radiosonde observation.
The ANLVER verifies a 1-degree grid forecasts against a 1-degree grid analysis using
the GFS model for the Northern Hemisphere; the Southern Hemisphere; and the Tropics.
Daily S1 scores from the GFS and NAM models are generated for the Mean Sea Level and the
500MB heights.
About Verification
Verification Contact Info:
Steven Lilly, System Integration Branch
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