Important Technical Documentation

Hamill, T. M., and Coauthors, J., 2014:
A Recommended Reforecast Configuration for the NCEP Global Ensemble Forecast System.
NOAA White paper, 24 pp.

Sela, J., 2010:
The Derivation of the Sigma Pressure Hybrid Coordinate Semi-Lagrangian Model Equations for the GFS.
NCEP Office Note 462, 31 pp.

Wei, M., Z. Toth, R. Wobus, and Y. Zhu, 2006:
Initial Perturbations Based on the Ensemble Transform (ET) Technique in the NCEP Global Ensemble Forecast System.
NCEP Office Note 453, 33 pp.