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    Description

    Smoke from both prescribed fires and wildfires can, under certain meteorological conditions, become entrapped within shallow layers of air near the ground at night and get carried to unexpected destinations as a combination of weather systems push air through interlocking ridge-valley terrain typical of the Piedmont of the Soutthern United States. Entrapped smoke confined within valleys is often slow to disperse. When moist conditions are present, hygroscopic particles within smoke may initiate or augment fog formation. With or without fog, smoke transported across roadways can create vistbility hazards. Planned Burn (PB)-Piedmont is a fine scale, time-dependent, smoke tracking model designed to run on a PC computer as an easy-to-use aid for land managers. PB-Piedmont gives high-resolution in space and time predictions of smoke movement within shallow layers at the ground over terrain typical of that of the Piedmont. PB-Piedmont applies only for weather conditions when smoke entrapment is most likely to occur-at night during clear skies and light winds. This paper presents the model descriptton and gives examples of model performance. In comparison with observations of entrapped smoke collected during two nights of a field project. The results show that PB-Piedmont is capable of describlng the movement of whole smoke plumes within the constraints for which the model was designed.

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    Citation

    Achtemeier, Gary L. 2005. Planned Burn-Piedmont. A local operational numerical meteorological model for tracking smoke on the ground at night: Model development and sensitivity tests. Internation Journal of Wildland Fire, 2005, 14, 85-98

    Keywords

    drainage winds, nocturnal smoke, smoke entrapment, visibility

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https://www.fs.usda.gov/treesearch/pubs/9520