WindNinja Mobile

Functionality & Mechanism Developed by the USDA Forest Service, WindNinja Mobile functions as a mobile interface for the WindNinja wind modeling system. The application initiates and visualizes high-resolution, spatially varying wind field simulations for a specified geographic area. It leverages multiple computational solvers, including conservation of mass (COM) and computational fluid dynamics (CFD), to model terrain-influenced wind. The interface facilitates remote execution of these complex simulations to support operational planning in wildland fire management and other environmental fields.

Evidence & Research Context

• An evaluation study comparing the model's computational fluid dynamics (CFD) and conservation of mass (COM) solvers determined that the CFD solver yields superior predictions at windward and lee side locations.
• The system improves near-surface wind forecasts when downscaling numerical weather predictions in complex terrain, particularly for wind direction under high-wind, near-neutral atmospheric stability conditions.
• A diurnal slope flow component integrates sensible surface heat flux and terrain characteristics to simulate thermally driven winds, which demonstrates a qualitative impact on subsequent fire spread simulations.

Intended Use & Scope This system is intended for wildland fire managers, incident meteorologists, and researchers requiring high-resolution wind field simulations in complex terrain. Its primary utility is as an operational decision-support tool. The model provides diagnostic wind adjustments and does not replace comprehensive meteorological forecasts; accuracy may vary with atmospheric stability and local conditions.