Avalanche.org
About
MCP server for looking up avalanche danger ratings, historic avalanche forecasts, and forecast GeoJSON from the Avalanche.org Public API. Not affiliated with Avalanche.org
Details
- Author
- haydenwade
- Categories
- Other, Developer Tools
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Setup
Install Avalanche.org in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/haydenwade/avalanche-org-mcp-server
Follow the installation instructions in the repository README, then restart your MCP client.
A minimalModel Context Protocol(MCP) server that wraps theAvalanche.org Public APImap-layer endpoints. It lets LLMs look up avalanche danger ratings by location, retrieve raw forecast GeoJSON, and query historic conditions.
- Danger lookup by lat/lon— find the avalanche zone for any point and get its current danger rating
- Historic danger lookup— same as above, but for a specific past date
- Raw map-layer GeoJSON— full FeatureCollection for all avalanche centers, or scoped to one center
Data sourced from theAvalanche.org Public API. See theAPI docsfor details.
Add this to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.jsonon macOS):
{ "mcpServers": { "avalanche-org": { "command": "npx", "args": ["-y", "avalanche-org-mcp-server"] } } }
No install required. Claude will download and run it automatically.
{ "mcpServers": { "avalanche-org": { "command": "avalanche-org-mcp-server" } } }
docker pull ghcr.io/haydenwade/avalanche-org-mcp-server:latest
{ "mcpServers": { "avalanche-org": { "command": "docker", "args": ["run", "--rm", "-i", "ghcr.io/haydenwade/avalanche-org-mcp-server:latest"] } } }
git clone https://github.com/haydenwade/avalanche-org-mcp-server.git cd avalanche-org-mcp-server npm install npm run build
{ "mcpServers": { "avalanche-org": { "command": "node", "args": ["/absolute/path/to/avalanche-org-mcp-server/dist/src/index.js"] } } }
Get the current avalanche danger rating for a lat/lon point. Returns the zone the point falls in, or the nearest zone ifpreferNearestis true.
{ "lat": 40.5763, "lon": -111.7522, "preferNearest": true, "centerId": "UAC" }
{ "match": "inside_zone", "distance_km": 0, "distance_miles": 0, "zone": { "id": "zone-1", "name": "Salt Lake", "state": "UT" }, "center": { "id": "UAC", "name": "Utah Avalanche Center", "timezone": "America/Denver", "link": "https://utahavalanchecenter.org" }, "danger": { "level": 3, "label": "Considerable", "color": "#f1a302" }, "travel_advice": "Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative decision-making essential.", "forecast_url": "https://utahavalanchecenter.org/forecast/salt-lake", "validity": { "start_date": "2026-03-22", "end_date": "2026-03-23" }, "warning": null }
historic_avalanche_danger_rating_by_point
Same as above, but for a specific historic date. Returns all the same fields plusday.
{ "lat": 40.5763, "lon": -111.7522, "day": "2025-02-24", "preferNearest": true }
{ "match": "inside_zone", "distance_km": 0, "distance_miles": 0, "zone": { "id": "zone-1", "name": "Salt Lake", "state": "UT" }, "center": { "id": "UAC", "name": "Utah Avalanche Center", "..." : "..." }, "danger": { "level": 3, "label": "Considerable", "color": "#f1a302" }, "travel_advice": "Dangerous avalanche conditions. ...", "forecast_url": "https://utahavalanchecenter.org/forecast/salt-lake", "validity": { "start_date": "2025-02-24", "end_date": "2025-02-25" }, "warning": null, "day": "2025-02-24" }
Returns the raw Avalanche.org map-layer GeoJSON FeatureCollection forallavalanche centers.
{ "geojson": { "type": "FeatureCollection", "features": [ "... full GeoJSON features ..." ] } }
Returns the raw map-layer GeoJSON FeatureCollection for asingleavalanche center.
{ "geojson": { "type": "FeatureCollection", "features": [ "... full GeoJSON features ..." ] } }
To interactively test tools with theMCP Inspector:
npx @modelcontextprotocol/inspector node dist/src/index.js
src/ index.ts # Entry point — server setup + stdio transport tools.ts # Tool registration constants.ts # API URLs and timeouts types.ts # GeoJSON type definitions api/ mapLayer.ts # Map-layer fetch + GeoJSON normalization lib/ geometry.ts # Point-in-polygon, haversine distance, bounds dangerLookup.ts # Danger rating lookup logic validation.ts # Date and coordinate validation test/ *.test.ts # Tests (node:test)
- Fork the repo
- Create a feature branch (git checkout -b my-feature)
- Make your changes and add tests
- Runnpm testto make sure everything passes
- Open a pull request
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