Data Sources & Attribution

Primary weather data

Current conditions, forecasts, air quality, marine conditions, and 20-year climate normals come from Open-Meteo's free hosted API (CC BY 4.0). A second vendor, OpenWeatherMap, and a US-only third vendor, NWS (api.weather.gov), feed a durable archival pipeline used for forecast-accuracy verification — see /reports/forecast-confidence. WeatherAPI.com and Visual Crossing are configured as additional forecast fallbacks.

Hazard & alert data

Severe weather alerts and nationwide news: NOAA/NWS (US-only, public domain). Hurricanes: NOAA National Hurricane Center. Earthquakes and volcanoes: USGS. Tsunami alerts: NOAA Tsunami Warning Centers. Airport/flight-delay status: FAA National Airspace System Status feed (US-only). Aurora forecasts: NOAA Space Weather Prediction Center.

Maps

Base map tiles: OpenStreetMap (ODbL, © OpenStreetMap contributors). Weather overlay tiles: OpenWeatherMap.

Update frequency

Live user-facing requests are cached for 5 minutes (severe alerts) to 1 hour (forecasts) — see our engineering documentation for the exact schedule per data type. A separate hourly job archives snapshots from every vendor for accuracy tracking, independent of what a visitor sees live.

Limitations

All forecast and hazard data is estimated by third parties and can be delayed, incomplete, or wrong — see our Weather & Safety Disclaimer. WeatherPerch does not independently verify upstream provider data and does not guarantee accuracy, completeness, or timeliness for any location.

Required attribution and licensing notices

Weather data by Open-Meteo.com (CC BY 4.0), with the applicable linked source notice and an indication where WeatherPerch adapts or combines the data.

Source: NOAA / National Weather Service; Source: U.S. Geological Survey; Source: Federal Aviation Administration; and Source: NASA POWER, where those sources are used and their applicable guidance requires or requests source identification. Do not imply endorsement or affiliation.

© OpenStreetMap contributors — map data and visible map attribution are provided under the applicable OpenStreetMap/ODbL and tile-usage requirements. The map attribution links to openstreetmap.org/copyright.

Commercial or plan-specific providers must retain the exact source credit, link, proprietary notice, and placement required by the applicable license or agreement. If a requirement is uncertain, it must be confirmed through legal or licensing review before the source is activated or redistributed.