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A western region guide to the ETA-29 model

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    "The National Center for Environmental Prediction (NCEP), formally known as NMC, has been developing and running numerical weather prediction models operationally since 1955. The first operational model was an equivalent barotropic model and from this model came the barotropic mesh model, which remained in use through 1985. The next major change to models came with the introduction of a six-layer hemispheric primitive equation (PE) model in 1966. A limited-area version of this model, known as the Limited-area Fine-mesh Model (LFM), became operational in 1971. It was replaced in 1977 by a finer-mesh model, known as the LFM II, but in 1981 the original grid mesh was restored. In August 1980, the current seven-layer PE model was replaced by a twelve-layer global spectral model, which has evolved considerably since them into the Medium Range Forecast model (MRF) and the Aviation (AVN) model. In the spring of 1985, a new Regional Analysis and Forecast System (RAFS) was introduced with the Nested Grid Model (NGM) serving as the forecast model. In June 1993, the Eta model replaced the LFM as the 'early' model run with 80 km resolution and 38 vertical layers. In early 1996, a 29 km version of the Eta model was tested in the field, with very positive results. By August 1996, the Eta-29 (commonly referred to as the Meso Eta model) was fully operational and proving its worth to the field"--Introduction.
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