A one-dimensional plume model was developed for use by fire-weather forecasters and others who want a small computer platform tool for vertical parcel method motions with respect to an ambient real sounding. The model includes cloud microphysics parameterizations for cloud water, rain, and ice particles, so the effects from condensation and glaciation can be included in the vertical motion. The model has a fire boundary condition that features a finite vertical velocity at the lower boundary, the ground, generated by a virtual plume below the ground. In this way numerical difficulties are avoided. This model has been tested with real soundings and fires. © by the Society of American Foresters. Abstract reproduced by permission.