METAR Server

MCP server for fetching and parsing METAR aviation weather data from NOAA's Aviation Weather Center.

Installation

Poetry (Development)

poetry install

Docker (Production)

docker-compose up -d

Usage

MCP Client Configuration

Poetry

Add to your MCP client configuration file:

{
  "mcpServers": {
    "metar": {
      "command": "poetry",
      "args": ["run", "python", "/path/to/metarmcp/server.py"],
      "cwd": "/path/to/metarmcp"
    }
  }
}

Docker

Add to your MCP client configuration file:

{
  "mcpServers": {
    "metar": {
      "command": "docker",
      "args": ["exec", "-i", "metar-mcp-server", "python", "server.py"]
    }
  }
}

Running Tests

poetry run pytest test_metar.py -v

Docker Commands

# Build and start
docker-compose up -d

# View logs
docker-compose logs -f

# Stop
docker-compose down

# Rebuild
docker-compose up -d --build

Tools

fetch_metar

Fetch raw METAR data for an airport by ICAO code.

Parameters:

• icao_code (string): Airport code (e.g., EFHK, KJFK, EGLL)

parse_metar

Parse raw METAR string into structured JSON.

Parameters:

• metar (string): Raw METAR string

Returns:

{
  "station": "EFHK",
  "time": "021720Z",
  "wind": {"direction": 180, "speed_kt": 12},
  "visibility": "9999",
  "temperature": 12,
  "dewpoint": 8,
  "pressure_hPa": 1013,
  "clouds": ["FEW020", "BKN050"]
}

get_cached_metar

Get METAR data with 30-minute caching.

Parameters:

• icao_code (string): Airport code

Returns:

• Cached data if fresh (<30 min)
• Fresh data from API if cache expired

Features

• Fetch real-time METAR and TAF data from NOAA
• Parse METAR/TAF into structured JSON
• Human-readable formatting with descriptions
• SQLite caching (30-minute TTL)
• Full test coverage
• Docker support with security best practices

Data Source

NOAA Aviation Weather Center: https://aviationweather.gov/

License

MIT