AFGWC has three cloud forecast models Five-Layer 5LAYER, High Resolution Cloud Prognosis HRCP, and Tropical Cloud Forecasting Model TRONEW . These models satisfy a wide range of requirements and have been in operation since the early 1970s. The 5LAYER model makes extra-tropical forecasts for periods up to 48 hours. Forecasts of layer and total cloud, cloud type, layer temperatures, and icing and weather conditions are made. The 5LAYER model uses a quasi-Lagrangian approach to make these forecasts. The trajectories needed for these forecasts are computed from the AWS Global Spectral Model GSM derived wind forecasts. The 5LAYER moisture is initialized from the Real-Time Nephanalysis Model RTNEPH layer cloud-amount and the Multi-layer Analysis Model MULTAN layer dew-point depression. The 5LAYER temperatures are initialized from the High Resolution Analysis System HIRAS and GSM derived temperatures. The High Resolution Cloud Prognosis HRCP model combines RTNEPH analyzed cloud input with 5LAYER trajectories to produce high resolution 25 nm , short-range out to 9 hour cloud forecasts. The TRONEW model uses the analyzed RTNEPH cloud to make 24 hour persistence cloud forecasts for the tropics.