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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
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.