The moisture model used for the Local AFOS MOS Program (LAMP) is described in this paper. The model predicts the degree of saturation in the single layer between 1000 and 500 mb by a moisture parameter known as the saturation deficit. Moisture is advected under the assumption that no evaporation or condensation occurs along the trajectory. The thickness and elevation of the advected air column determine the degree of saturation. Precipitation is forecast when the air column is saturated.

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