precip-analyze-atlas14-variance

Analyze spatial variability of NOAA Atlas 14 precipitation frequency estimates within HEC-RAS model domains using intelligent extent-based downloading. Helps determine whether uniform rainfall assumptions are appropriate for rain-on-grid modeling by calculating min/max/mean/range statistics within 2D flow areas or project extents. Uses NOAA CONUS NetCDF with HTTP byte-range requests for 99.9% data reduction compared to traditional state-level ZIP downloads. Use before rain-on-grid modeling to assess uniform rainfall validity, for large model domains where spatial variance matters, for multi-event comparison across return periods, or for engineering report generation. Triggers: atlas 14 variance, atlas14 variance, precipitation variance, spatial variance analysis, uniform rainfall, spatially variable rainfall, precipitation spatial variability, rain-on-grid variance, atlas 14 grid, atlas14 grid, noaa atlas 14 conus, precipitation frequency grid, assess uniform rainfall, extent-based precipitation, 2d flow