MCP Weather Server for Claude

This project implements an MCP server using the fastmcp interface, designed to serve as a Claude tool. It connects to the U.S. National Weather Service (NWS) API to provide real-time weather alerts and forecasts.

✨ Features

• 🔔 Get Active Alerts: Retrieve current weather alerts by U.S. state.
• 🌤️ Get Forecast: Fetch detailed forecasts by latitude and longitude.
• ⚡ Asynchronous & Fast: Built with httpx and fastmcp for high-performance async operations.

🧠 Powered by Claude

This server is built to serve as a Claude-compatible external tool via the MCP protocol, using stdio transport.

🛠️ Code Overview

Main Components

• FastMCP: Initializes the MCP server.
• make_nws_request(): A helper for calling the NWS API with retries and headers.
• get_alerts(state: str): Claude-accessible tool to get weather alerts for a given U.S. state.
• get_forecast(latitude: float, longitude: float): Claude-accessible tool to get the forecast for any lat/lon pair.

Example Tool Usage

await get_alerts("CA")
await get_forecast(37.7749, -122.4194)

🌐 External API

National Weather Service API: https://weather.gov/documentation/services-web-api

📄 License

MIT License. Feel free to fork, modify, and use this server as a base for your own Claude tools.

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