PMSL Anomaly Correlation Verification   This document describes
the procedure employed to generate anomaly correlation values
for the NCEP Medium Range Forecast Desk (MRFD) and the available
model guidance. The first section discusses the data source and
computation of climatological parameters. Section 2 deals with
the comparison of individual forecasts to the NCEP surface
analysis and generation of the verification database.  1. The
Climatology  The climatological parameters required for the
computation of standardized anomaly correlations are daily means
and standard deviations of the pressure at mean sea level
(PMSL). Monthly means of PMSL are available for more than 50
years from the NCEP-NCAR reanalysis (Kistler, et al., 2001) on a
2.5o by 2.5o latitude-longitude grid. A mean grid for each month
of the year was obtained by averaging over 41-years (1958-1998).
Similarly, a standard deviation was computed for each month of
the year using the 41 values from the series of monthly mean
grids. To get daily va