During forest fires the heat, moisture, and aerosols are carried out to the troposphere due to the intensive convective activity above zones of burning. The influence of these substances on processes of cloud and precipitation formation is studied with the help of numerical eddy-resolving model of the atmospheric boundary layer. It is shown that heat and moisture coming from the fire zone intensify the cloud formation processes, while aerosol fills up the atmosphere by water vapor condensation nucleus what results in formation of small suspended droplets below zero isotherm level. If the cloud top is overcooled (just such clouds give intensive precipitation), a plenty of aerosol particles, more than 1 micron in size getting here, causes a crystallization of overcooled drops and precipitation subsiding or stopping.

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