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Predicting surface winds in complex terrain for use in fire spread models

Author(s): Jason M. Forthofer, Bret W. Butler, Kyle S. Shannon, Mark A. Finney, Larry S. Bradshaw, Richard D. Stratton
Year Published: 2003
Description:

Fire behavior predictions and forecasts are vital to tactical planning on wildland firefighting incidents. One major source of uncertainty in fire behavior predictions is spatial variation in the wind fields used in the fire models. In most cases wind data are limited to only a few specific locations, none of which may be actually near the fire location. Mountainsides, valleys, ridges, atmospheric stability, and the fire itself, influence both the speed and direction of wind flows. Fire analysts, meteorologists and fire managers are left to general forecast information, guesswork and expert opinion for estimating spatial wind variability. These methods provide rough estimates of wind speed and direction at ridges and to a lesser extent in the valleys, but are subject to local knowledge and the skill level of the analyst. Short-range meteorological forecasts and fire behavior calculations (e.g. 6-12 hrs) on large fires could greatly benefit from information on local winds over the entire terrain, at resolutions of 10 to 100 meters. The study described herein has three objectives: 1) develop a methodology for using commercially available computational fluid dynamics (CFD) software to produce high resolution surface wind maps and 2) quantify the effect of high resolution surface wind data on fire behavior predictions, and 3) address the fundamental science question of the practical potential for modeling fire-induced changes to the wind fields. This paper describes preliminary results of the modeling process applied to fire incidents in the Northern Rockies during the 2003 fire season.

Citation: Forthofer, J. M.; Butler. B.W.; Shannon, K.S.; Finney, M.A.; Bradshaw, L.S.; Stratton, R. 2003. Predicting surface winds in complex terrain for use in fire spread models. In: Proceedings of the 5th symposium on fire and forest meteorology and 2nd Wildland Fire Ecology and Fire Management Congress; 2003 November 16-20; Orlando, FL.
Topic(s): Fire Behavior, Fire Prediction, Simulation Modeling, Weather
Ecosystem(s): None
Document Type: Conference Proceedings
NRFSN number: 8438
FRAMES RCS number: 2315
Record updated: Jun 13, 2018