In some cases, the model distinguishes differences for four seasons. Output from the LFM MOS model is available in bulletin format out to 60 hours, citing best chances for maximum and minimum temperatures and probabilities for different types of weather occurrence, such as low ceilings, fog, and thunderstorms.
Output is also available as a computer-worded forecast for a region or a specific location.
Implemented in April 1987, the NGM Perfect Prog is very similar to the LFM MOS output in both graphics and bulletin products. The situation is then compared to the historical conditions, and probabilities for various types of weather occurrences are calculated. NGM Perfect Prog forecasts are referred to as NGM Probability listings. Although the National Weather Service produces numerous facsimile charts to distribute oceanographic and meteorological information to its own forecast support offices, DOD, and public users, we cannot describe all of those charts in this training manual. To do so, we would need to publish a separate volume dealing with nothing but the NWS facsimile products.