Weather polygons

Temporal

Weather alert/impact polygons (storm tracks, flood zones, air-quality advisories) are issued, updated, and retracted on an hourly-to-sub-hourly cadence; using a cached or stale version misrepresents current conditions for weather-triggered targeting or reporting.

Detection

Polygon issued/valid timestamp older than the source's typical update cadence for that alert type.

Mitigation

Re-fetch weather polygons on the vendor's native update cadence, never cache beyond it
Timestamp every cell-weather join with the polygon's issued time, not the query time

Affected conversions

PolygonH3 (intersects)
RasterH3