| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| ETA model | Weather | One of the operational numerical forecast models run at NCEP. The Eta is run twice daily, with forecast output out to 48 hours. The ETA model is a newer model, which is very similar to the NGM model and forecasts the same atmospheric variables. The main difference is the ETA model has better resolution (29 kilometers). In other words, the grid box is much smaller than in the NGM. This allows the ETA to give a more detailed forecast over the USA. The ETA model was named after the ETA coordinate system, which is a mathematical coordinate system that takes into account topographical features such as mountains. As a result of using this coordinate system and the higher resolution, the ETA model has a much more accurate picture of the terrain across the USA. By the way, the name, ETA is the seventh letter of the Greek alphabet. (references) | |
| ETA model (ETA) | Weather | The ETA model, like the NGM, is a grid-point model. The ETA is a relatively new model which provides forecast output to 60 hours and uses the eta coordinate system in the vertical, as opposed to pressure coordinates. The Eta model is run at much higher horizontal resolution that the NGM model, and is currently run at 32 km grid spacing over its entire domain. Many local offices run a version of the Eta model at much higher resolution than is available otherwise. These mesoscale forecasts are experimental in nature, but may be referred to from time to time in the AFD. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
