Extreme Weather Alerts Map
A live, interactive extreme weather alerts map that pulls active severe-weather warnings from five official agencies across the world and draws them on a single global map. Watch the full-screen map above update in real time, then scroll for details on the data, the colour coding, and how to use it.
What this severe weather map shows
This is a global weather warnings map. Every active alert — tornado and thunderstorm warnings, flood and flash-flood warnings, heavy rain and snow, high wind, storm surge, high seas, heatwave and cold-snap advisories, and more — is normalized into one consistent schema and plotted on LatLng vector tiles. Agencies that publish precise alert polygons are rendered as shaded warning areas; feeds that only publish regional or text products are shown at the relevant source or region centroid so nothing is lost. The result is a single live weather warnings map spanning North America, Europe, Australia, and Japan in one view.
Multi-agency data sources: NWS, EC, MeteoAlarm, BOM, JMA
No single agency covers the whole planet, so this map merges five authoritative national and regional feeds into one global weather alerts layer:
- NWS (United States) — the National Weather Service active-alerts API, with precise warning polygons for the US and its territories.
- Environment Canada (EC) — the Meteorological Service of Canada GeoMet weather-alerts GeoJSON collection.
- MeteoAlarm (Europe) — the pan-European awareness system aggregating CAP-style alerts from national met services across the EU.
- BOM (Australia) — the Bureau of Meteorology state-by-state warning feeds.
- JMA (Japan) — the Japan Meteorological Agency warning JSON, mapped to prefecture areas.
The worker refreshes a normalized snapshot of every feed every five minutes, so the extreme weather alerts map reflects near-real-time conditions without hammering the upstream agencies.
How alerts are categorized and colored
Different agencies grade severity differently, so each incoming alert is mapped onto one common four-level scale. On the map and in the legend the colours are consistent everywhere:
- Severe / extreme — red. Life-threatening or major-impact warnings.
- Moderate — orange. Significant watches and warnings.
- Minor / advisory — green. Lower-impact advisories and statements.
Polygon alerts are filled and outlined in their severity colour; point alerts use a matching coloured marker. Sorting and the header stats always surface the most severe active warnings first.
How to use the map
- Filter by region — narrow to the United States, Canada, Europe, Australia, or Japan.
- Filter by severity — show only severe-and-above, moderate, or minor alerts.
- Search — jump to any city or
lat,lng coordinate.
- Click any polygon, marker, or side-panel row to inspect the source alert — event type, effective and expiry times, area, status, and a link to the issuing agency.
- Pan and zoom — the visible-alerts panel and counts update to match your current view.
Why a global weather-alerts map is useful
Severe weather does not respect borders, and each national agency publishes in its own format, portal, and language. Bringing NWS, EC, MeteoAlarm, BOM, and JMA warnings into one live weather warnings map makes it easy to monitor storms across regions at a glance — useful for travellers, logistics and supply-chain teams, journalists, researchers, and anyone tracking global severe weather. For a deeper walkthrough and background, see the extreme weather alerts map resource page.
Built on the LatLng maps platform
This is a live demo of the LatLng mapping stack. The severe-weather warnings are rendered on LatLng basemap vector tiles, and you can serve your own point or polygon data the same way through the Dataset Tiles API. Both are available on a free tier — build your own live alerts or data map in minutes.
Frequently asked questions
Where does the weather alert data come from?
Active warnings are pulled from five official agencies — the US National Weather Service (NWS), Environment Canada, Europe's MeteoAlarm network, Australia's Bureau of Meteorology (BOM), and the Japan Meteorological Agency (JMA) — and normalized into one global map.
How often does the map update?
A normalized snapshot of every source feed is refreshed every five minutes, so the map reflects near-real-time active alerts. The visible list and counts update as you pan and zoom.
Is this an official emergency alerting system?
No. This is a visualization demo, not a life-safety product. Always follow warnings and instructions directly from your local official weather agency and emergency services.
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