HIRESW MODEL RUNS
The HIRESW Model is a minor model not widely known about.
It is run for the US 3 times a day, and Alaska the fourth. The HIRESW goes out to 48 hours.
SREF MODEL RUNS
The SREF (Short Range Ensemble Forecast) is run 4 times a day at times in between other model runs. They run at odd times. The SREF is known as a very reliable model for short-range views on storms.
RUC MODEL RUNS (One hour forecasts each)
The RUC (Rapid Update Cycle) model is a short range model updated every hour. It goes out to 4 hours. The RUC is going to be replaced in August 2011 by the Rapid Refresh model. For a simple forecast, use the RUC Model Unisys link.