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Dispersion gives a general indication of the atmosphere's ability to disperse smoke. The forecast of Dispersion can be displayed as a category, adjective, or value. It is usually forecast for nighttime periods, but can be utilized in daytime periods as well. Dispersion is computed in a number of ways, but is typically based on surface wind speed. Dispersion information can assist fire personnel when dealing with potential smoke problems, especially at night when light winds exist beneath a temperature inversion. |