api/storm-polygons.js — Vercel proxy that fetches historical NWS storm-based
warnings (severe thunderstorm + tornado) from IEM for WFO FWD (Fort Worth),
covering Collin County / Plano TX. Filters to local bounding box, derives
severity from polygon area (area2163 km²), estimates impacted homes from
density, derives area name from centroid. Cached 12h on Vercel edge.
useStormEvents.js — switched to real IEM data (USE_MOCK=false). Fetches full
36-month dataset once on mount; all range/type/severity filtering stays
client-side in useMemo for instant UI response. Falls back to
MOCK_STORM_EVENTS when /api routes are unavailable (local vite dev).
Satyam-Rastogi