Data Publications

NCEP FNL Operational Model Global Tropospheric Analyses, July 1976 to April 1997

  • NCEP FNL Operational Model Global Tropospheric Analyses, July 1976 to April 1997
  • NCAR_DS082.0
  • Baker, Waymon, ed, 1992: Research Highlights of the NMC Development Division: 1989-1991. , NOAA, 469 pp.. Parrish, D.F., and Derber, J.C., 1992: The National Meteorological Center's Spectral Statistical-Interpolation Analysis System. Mon. Wea. Rev., 120, 1747-1763. Randel, W.J., 1992: Global atmospheric circulation statistics, 1000 - 1 mb. TN-366+STR, National Center for Atmospheric Research, 256 pp.. Kanamitsu, M., 1989: Description of the NMC Global Data Assimilation and Forecast System. Wea. and Forecasting, 4(3), 335-342. Trenberth, K.E., and J.G. Olson, 1988: Evaluation of NMC Global Analyses: 1979-1987. TN-299+STR, National Center for Atmospheric Research, 82 pp.. Jenne, Roy L., 1986: NMC Analyses (unpublished). , NCAR, 14 pp., URL: Cressman, G.P., 1959: An Operational Objective Analysis System. Mon. Weather Rev., 87, 367-374.
  • The Final (FNL) global tropospheric analyses archived here were produced by NCEP's Global Forecast System (GFS), which was run operationally at 12-hour intervals to make multiple-day weather forecasts, from July 1976 through mid-April 1997. FNLs are analyses that are produced after the model has completed the forecast cycle, and they include the most complete set of observations available for a given cycle. The FNL from a given cycle, which is the best available analysis, is then used in the initialization of the next cycle. FNL Data are available on pairs of 2.5-degree hemispheric grids (North and South) at the Earth's surface, twelve vertical levels from 1000 millibars up to 50 millibars, the tropopause, boundary and some sigma layers, and a few other levels. Parameters include surface pressure, sea level pressure, geopotential height, temperature, sea surface temperature, potential temperature, relative humidity, snow depth (weekly, Northern Hemisphere only) precipitable water, u- and v- winds, and vertical motion.
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