The Eta is another National Weather Service model. The name "Eta" derives from the model's vertical coordinate known as the "eta" or "step-mountain" coordinate and describes a constant height coordinate model system. The latest iteration, Eta-32 (32km resolution and 45 altitude levels), produces 48hr forecasts twice a day at 0000 and 1200 UTC, a 33hr forecast at 0300 UTC, and a 30hr forecast at 1800 UTC