Weather MCP Server

A Model Context Protocol (MCP) server that provides weather alerts and forecasts for US locations using the National Weather Service API.

Features

• get-alerts: Get active weather alerts for a US state (by two-letter code, e.g. CA, NY).
• get-forecast: Get a weather forecast for a specific latitude and longitude.

Requirements

• Node.js v16 or higher
• npm (comes with Node.js)

Setup

1. Clone or copy this repository to your machine.
2. Install dependencies:

   npm install
   

3. Build the server:

   npm run build
   

Running the Server

To start the server (for local development or direct use):

npm start

Or, to run the built server directly:

node build/index.js

MCP Integration (Claude for Desktop Example)

To use this server with Claude for Desktop or another MCP host, add the following to your claude_desktop_config.json (update the path as needed):

{
  "mcpServers": {
    "weather": {
      "command": "node",
      "args": [
        "/ABSOLUTE/PATH/TO/weather-mcp/build/index.js"
      ]
    }
  }
}

• Replace /ABSOLUTE/PATH/TO/weather-mcp/build/index.js with the absolute path to your built server file.
• Save and restart your MCP host (e.g., Claude for Desktop).

Usage

Once connected, you can use the following tools:

get-alerts

• Description: Get weather alerts for a US state.
• Input: state (string, two-letter US state code, e.g. "CA")
• Output: List of active alerts or a message if none are found.

get-forecast

• Description: Get weather forecast for a location.
• Input:
  • latitude (number, e.g. 37.7749)
  • longitude (number, e.g. -122.4194)
• Output: Forecast for the next several periods.

Development

• Edit src/index.ts to modify or extend the server.
• Run npm run build after making changes.

License

MIT