Instrument : Eta Model Runs (ETA)
Instrument Categories
Derived Quantities and Models
General Overview
NOAA's National Centers for Environmental Prediction run a regional numerical weather analysis and forecast system that covers the entire North American Continent. The data archived by ARM since 1993-06-16 come from the 00Z and 12Z model runs and include the 0h-analysis and 6h-forecast data resulting in 4 files per day.
The model used to be called "ETA", which derived from the model's vertical coordinate known as the "eta" or "step-mountain" coordinate. In 2005, the model underwent a major redesign and was renamed North American Mesoscale (NAM) Analysis and Forecast System.
