Graham McIntire a840cb9629 Phase 5: Frontal geometry detection via Thermal Front Parameter ... FrontalAnalysis module (Weather.FrontalAnalysis): - detect_fronts/3 computes the Thermal Front Parameter (TFP) from 2D grids of surface temperature and pressure using Nx vectorized ops. TFP = -nabla|nabla(theta)| . nabla(theta)/|nabla(theta)|. Most negative values mark cold fronts. - central_gradient/1 for 2D finite differences with edge handling - nearest_front/3 finds closest front point with distance and bearing - path_front_angle/2 computes angle between a QSO path and the front (0 = parallel = good, 90 = crosses = dead) Backtest feature stubs for distance_to_front and parallel_to_front (return nil until the pipeline caches per-cell frontal features from the hourly HRRR grid run). The FrontalAnalysis module itself is tested and ready for integration. NEXRAD spike docs also included in this commit.		2026-04-10 08:56:44 -05:00
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features.ex	Phase 5: Frontal geometry detection via Thermal Front Parameter	2026-04-10 08:56:44 -05:00