# aviation-weather-mcp-server [Health: Active] **Category:** πŸ’» Developer Tools **Repository:** https://github.com/cyanheads/aviation-weather-mcp-server **GitHub Stars:** 2 **Views:** 0 **Installs:** 0 **Upvotes:** 0 **Directory Page:** https://allmcps.com/mcp/aviation-weather-mcp-server ## Description Fetch METARs, TAFs, PIREPs, and SIGMETs/AIRMETs from the NWS Aviation Weather Center. ## Claude Desktop Quick Installation Install path detected from listing signals. Uses `bunx` (confidence: high): ```json "mcpServers": { "aviation-weather-mcp-server": { "command": "bunx", "args": ["@cyanheads/aviation-weather-mcp-server@latest"] } } ``` ## Documentation & README

@cyanheads/aviation-weather-mcp-server

Fetch METARs, TAFs, PIREPs, and domestic SIGMETs from the NWS Aviation Weather Center via MCP. STDIO or Streamable HTTP.

5 Tools β€’ 1 Prompt

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**Public Hosted Server:** [https://aviation-weather.caseyjhand.com/mcp](https://aviation-weather.caseyjhand.com/mcp)
--- ## Tools Five tools covering aviation weather β€” station lookup, current observations, terminal forecasts, pilot reports, and active advisories: | Tool | Description | |:-----|:------------| | `aviation_find_stations` | Resolve airports and weather stations by ICAO ID, bounding box, or US state. Returns ICAO/IATA/FAA IDs, coordinates, elevation, and available data types. | | `aviation_get_metar` | Get current weather observations (METARs) for one or more airports. Returns decoded wind, visibility, ceiling, present weather, temp/dewpoint, altimeter, cloud layers, flight category (VFR/MVFR/IFR/LIFR), and the raw METAR string. | | `aviation_get_taf` | Get Terminal Aerodrome Forecasts for one or more airports. Returns each forecast period with valid times, surface wind, low-level wind shear, visibility, decoded weather, cloud layers, and vertical visibility into a forecast obscuration, plus the raw TAF string. | | `aviation_get_pireps` | Get recent Pilot Reports near an airport or within a bounding box. Returns decoded turbulence, icing, and cloud reports with altitude, aircraft type, intensity, and the raw PIREP string. | | `aviation_get_advisories` | Get active domestic SIGMETs for a region. Returns hazard type (CONVECTIVE, TURBULENCE, ICING, IFR), severity, altitude range, valid period, polygon coordinates, and raw text. | ### `aviation_find_stations` Resolve and discover weather stations by multiple search modes. - Look up one or more stations by 4-letter ICAO ID (up to 20 IDs per call) β€” lookup is ICAO-only, but each returned record includes its IATA/FAA aliases when available - Discover all stations within a geographic bounding box - List stations for one of the 50 US states or DC via two-letter USPS code (uses bbox + client-side state filter) - Returns `data_types` (METAR, TAF, etc.) so agents can confirm what's available before querying - Every result states whether the upstream 400-row cap cut it, so a truncated draw is never mistaken for every station in the area β€” a capped state query also reports the row count from before the state filter, and a smaller `bbox` is the named lever --- ### `aviation_get_metar` Fetch current or recent METAR observations (1–10 stations per call). - `hours` parameter (1–12) returns observation history per station; default 1 returns only the most recent - Flight category (VFR/MVFR/IFR/LIFR) is returned directly from the AWC API β€” no client-side computation needed - Decodes cloud layers, wind with gusts, visibility, and present weather (the raw groups plus plain English, one reading per group) in addition to the raw METAR string - Ceiling covers broken, overcast, and obscuration layers, and reports whether the height was measured or is an indefinite ceiling β€” vertical visibility into an obscuration - METAR type field distinguishes `METAR` (routine) from `SPECI` (special observation triggered by significant weather change) - Every batch reports which of the requested stations came back, so a partial result is never mistaken for full coverage β€” missing IDs are named with recovery guidance --- ### `aviation_get_taf` Fetch Terminal Aerodrome Forecasts for 1–4 airports. - Returns structured forecast periods with change types (`FM`, `TEMPO`, `BECMG`) and probabilities - Forecast weather decoded group by group beside the raw groups (`-SHRA BR` β†’ `light rain showers; mist`), the same shape `aviation_get_metar` returns - Forecast obscurations keep their layer and carry the vertical visibility into them (`VV002` β†’ a 200 ft indefinite ceiling), rather than reading as a clear sky - Low-level wind shear (`WS020/20040KT`) is decoded to the shear-layer top and the forecast wind at that height - `valid_from` / `valid_to` in ISO 8601 for straightforward time comparisons - Every batch reports which of the requested stations came back, so a partial result is never mistaken for full coverage β€” missing IDs are named with recovery guidance --- ### `aviation_get_pireps` Search for recent Pilot Reports by station+radius or bounding box. - `station_id` + `distance_nm` (10–500 nm, 100 when omitted) for radial search around an airport - `bbox` for geographic area search β€” useful for en-route corridor checks; `distance_nm` has no meaning here and is rejected alongside it - `altitude_min_ft` / `altitude_max_ft` filters to isolate reports at cruise altitude, either bound alone or both (min must not exceed max) - Turbulence and icing arrays include up to two layers per report (as reported by the API) - Every result states whether the upstream 400-row cap cut it, naming `bbox`, `distance_nm`, and `hours` as the levers that narrow a query before the cap applies β€” the altitude filter runs after it and cannot recover a dropped report - Note: absence of PIREPs does not mean smooth conditions β€” they are sparse by nature --- ### `aviation_get_advisories` List currently active domestic SIGMETs. - `advisory_type` filter: `sigmet` or `all` (default) β€” both return the active SIGMET set - `hazard` filter: `CONVECTIVE`, `TURBULENCE`, `ICING`, `IFR` - `bbox` filter applied client-side (AWC API returns all active advisories; the tool filters by polygon overlap) - AIRMETs are not served. The upstream feed carries domestic SIGMETs only, so `advisory_type: airmet` and the `MTN OBSCN`, `SURFACE WIND`, and `LLWS` hazards are rejected with guidance rather than answered with SIGMETs or an empty array - During fair-weather periods, no SIGMETs may be active β€” an empty result is a valid state, not an error --- ## Prompts | Type | Name | Description | |:-----|:-----|:------------| | Prompt | `aviation_preflight_brief` | Structure a preflight weather briefing for one or more airports. Guides the LLM to call `aviation_get_metar`, `aviation_get_taf`, and `aviation_get_advisories` in sequence and synthesize a go/no-go picture with flight categories and active hazards. | All resource data is reachable via tools. This server has no resources β€” all aviation weather data is time-sensitive (METARs valid ~1 hour, advisories minutes to hours) and unsuitable for stable-URI resources. --- ## Features Built on [`@cyanheads/mcp-ts-core`](https://www.npmjs.com/package/@cyanheads/mcp-ts-core): - Declarative tool and prompt definitions β€” single file per primitive, framework handles registration and validation - Unified error handling β€” handlers throw, framework catches, classifies, and formats - Pluggable auth: `none`, `jwt`, `oauth` - Structured logging with optional OpenTelemetry tracing - STDIO and Streamable HTTP transports Aviation-weather-specific: - Keyless β€” no API key or authentication required; all data is from the public AWC Data API - Single service (`aviation-weather-service`) with retry + exponential backoff for the keyless public endpoint - Raw coded strings (`rawOb`, `rawTAF`, `rawAirSigmet`) surfaced alongside decoded fields so agents have both layers - Stateβ†’bbox table enables US-state station queries that the AWC API doesn't natively support - Server-level `instructions` field surfaces the "not an official briefing" safety disclaimer to all clients on `initialize` Agent-friendly output: - Flight category (`VFR`/`MVFR`/`IFR`/`LIFR`) as a discriminated string field β€” agents can branch on it without parsing ceiling + visibility - Structured error contracts with typed `reason` fields and `recovery` hints (e.g., "Verify ICAO IDs with `aviation_find_stations`") - `aviation_preflight_brief` prompt encodes the correct METAR β†’ TAF β†’ PIREPs β†’ advisories briefing sequence that agents frequently get wrong by omitting steps --- ## Getting started ### Public Hosted Instance A public hosted instance is available at `https://aviation-weather.caseyjhand.com/mcp`. Add it to your MCP client configuration: ```json { "mcpServers": { "aviation-weather": { "type": "streamable-http", "url": "https://aviation-weather.caseyjhand.com/mcp" } } } ``` ### Self-hosted / local Add the following to your MCP client configuration file. ```json { "mcpServers": { "aviation-weather": { "type": "stdio", "command": "bunx", "args": ["@cyanheads/aviation-weather-mcp-server@latest"], "env": { "MCP_TRANSPORT_TYPE": "stdio", "MCP_LOG_LEVEL": "info" } } } } ``` Or with npx (no Bun required): ```json { "mcpServers": { "aviation-weather": { "type": "stdio", "command": "npx", "args": ["-y", "@cyanheads/aviation-weather-mcp-server@latest"], "env": { "MCP_TRANSPORT_TYPE": "stdio", "MCP_LOG_LEVEL": "info" } } } } ``` Or with Docker: ```json { "mcpServers": { "aviation-weather": { "type": "stdio", "command": "docker", "args": [ "run", "-i", "--rm", "-e", "MCP_TRANSPORT_TYPE=stdio", "ghcr.io/cyanheads/aviation-weather-mcp-server:latest" ] } } } ``` For Streamable HTTP, set the transport and start the server: ```sh MCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 bun run start:http # Server listens at http://localhost:3010/mcp ``` ### Prerequisites - [Bun v1.3.0](https://bun.sh/) or higher (or Node.js v24+). - No API key required β€” the AWC Data API is fully public and keyless. ### Installation 1. **Clone the repository:** ```sh git clone https://github.com/cyanheads/aviation-weather-mcp-server.git ``` 2. **Navigate into the directory:** ```sh cd aviation-weather-mcp-server ``` 3. **Install dependencies:** ```sh bun install ``` 4. **Configure environment:** ```sh cp .env.example .env # edit .env if you need to override AWC_BASE_URL or AWC_TIMEOUT_MS ``` --- ## Configuration | Variable | Description | Default | |:---------|:------------|:--------| | `AWC_BASE_URL` | Base URL for the NWS AWC Data API. | `https://aviationweather.gov/api/data` | | `AWC_TIMEOUT_MS` | Per-request timeout in milliseconds (1000–60000). | `10000` | | `MCP_TRANSPORT_TYPE` | Transport: `stdio` or `http`. | `stdio` | | `MCP_HTTP_PORT` | Port for HTTP server. | `3010` | | `MCP_SESSION_MODE` | HTTP session handling: `auto` (resolves to `stateful`), `stateful`, or `stateless`. The shipped `.env.example` and Docker image pin `stateless` β€” no tool here needs a multi-round-trip input. | `stateless` | | `MCP_AUTH_MODE` | Auth mode: `none`, `jwt`, or `oauth`. | `none` | | `MCP_LOG_LEVEL` | Log level (RFC 5424). | `info` | | `OTEL_ENABLED` | Enable [OpenTelemetry instrumentation](https://github.com/cyanheads/mcp-ts-core/tree/main/docs/telemetry). | `false` | See [`.env.example`](https://github.com/cyanheads/aviation-weather-mcp-server/blob/HEAD/.env.example) for the full list of optional overrides. --- ## Running the server ### Local development - **Build and run:** ```sh bun run rebuild bun run start:stdio # or bun run start:http ``` - **Run checks and tests:** ```sh bun run devcheck # Lint, format, typecheck, security bun run test # Vitest test suite bun run lint:mcp # Validate MCP definitions against spec ``` ### Docker ```sh docker build -t aviation-weather-mcp-server . docker run --rm -p 3010:3010 aviation-weather-mcp-server ``` The Dockerfile defaults to HTTP transport, stateless session mode, and logs to `/var/log/aviation-weather-mcp-server`. OpenTelemetry peer dependencies are installed by default β€” build with `--build-arg OTEL_ENABLED=false` to omit them. --- ## Project structure | Directory | Purpose | |:----------|:--------| | `src/index.ts` | `createApp()` entry point β€” registers tools/prompts and inits services. | | `src/config` | Server-specific env var parsing (`AWC_BASE_URL`, `AWC_TIMEOUT_MS`). | | `src/services/aviation-weather` | AWC Data API client β€” HTTP fetch, retry with exponential backoff, response normalization. | | `src/mcp-server/tools` | Tool definitions (`*.tool.ts`). | | `src/mcp-server/prompts` | Prompt definitions (`*.prompt.ts`). | | `tests/` | Unit and integration tests mirroring `src/`. | --- ## Development guide See [`CLAUDE.md`](https://github.com/cyanheads/aviation-weather-mcp-server/blob/HEAD/CLAUDE.md) for development guidelines and architectural rules. The short version: - Handlers throw, framework catches β€” no `try/catch` in tool logic - Use `ctx.log` for request-scoped logging, `ctx.state` for tenant-scoped storage - Register new tools and prompts via the barrels in `src/mcp-server/*/definitions/index.ts` - Wrap external API calls: validate raw β†’ normalize to domain type β†’ return output schema; never fabricate missing fields > **Not an official preflight briefing.** Data from the AWC is informational only. Real flight planning requires an authorized source (e.g., Leidos/1800wxbrief.com). The server surfaces this disclaimer via its `instructions` field sent on every `initialize`. --- ## Contributing Issues and pull requests are welcome. Run checks and tests before submitting: ```sh bun run devcheck bun run test ``` --- ## License Apache-2.0 β€” see [LICENSE](https://github.com/cyanheads/aviation-weather-mcp-server/blob/HEAD/LICENSE) for details.