In a very unstable airmass, the eta predicts almost 5 inches of rain from “grid scale” processes and less than an inch from its convective parameterization scheme. Does this look reasonable?
Such a forecast sometimes messes up the mass and wind fields from the models.
The problem is more common with the AVN/MRF than eta. However, it can happen with any convective parameterization scheme
Eta 24-30 hour forecast precipitation from grid scale processes v.t. 06Z July 26
Eta 24-30 hour forecast precipitation from convective parameterization scheme v.t. 06Z July 26