🌩️ MCP Weather Alerts Tool using FastMCP + Claude Desktop
@nahilahmed
About 🌩️ MCP Weather Alerts Tool using FastMCP + Claude Desktop
A Python MCP (Model Context Protocol) server that fetches real-time weather alerts by U.S. state using api.weather.gov, built with FastMCP and integrated into Claude Desktop.
Config
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"mcp-weather-alert-tool": {
"command": "uv",
"args": [
"init",
"mcpcrashcourse",
"#",
"start",
"new",
"project"
]
}
}
}Tools
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Overview
What is MCP Weather Alerts Tool using FastMCP + Claude Desktop?
This project implements a custom MCP (Model Context Protocol) server using the FastMCP Python SDK, integrating with Claude Desktop to enable an AI assistant to retrieve real-time weather alerts for any U.S. state via the api.weather.gov API.
How to use MCP Weather Alerts Tool using FastMCP + Claude Desktop?
Install dependencies using uv add "mcp[cli]" httpx and place the weather.py tool in a server/ folder. Launch interactively with uv run mcp dev server/weather.py and test via MCP Inspector at http://localhost:6757. For Claude Desktop, add a weather entry to claude_desktop_config.json pointing to uv run mcp run <path>/server/weather.py, restart the app, and ask for alerts by state (e.g., “What are the weather alerts for Texas?”).
Key features of MCP Weather Alerts Tool using FastMCP + Claude Desktop
- Implements a custom MCP server with FastMCP Python SDK
- Uses
httpxto call real-time weather alerts from api.weather.gov - Returns structured information: event, severity, description, and instructions
- Integrates directly with Claude Desktop as an MCP tool
- Testable interactively via MCP Inspector
Use cases of MCP Weather Alerts Tool using FastMCP + Claude Desktop
- Ask Claude Desktop to retrieve active weather alerts for any U.S. state
- Integrate live alert data into AI-powered workflows or assistants
- Prototype and debug MCP tools using the built-in MCP Inspector UI
FAQ from MCP Weather Alerts Tool using FastMCP + Claude Desktop
What runtime and dependencies are required?
Python 3.x with uv package manager, plus mcp[cli] and httpx. The project uses uv.lock for dependency locking.
How can I test the tool without Claude Desktop?
Run uv run mcp dev server/weather.py to launch the MCP Inspector at http://localhost:6757, where you can call get_alerts with a state code.
Where does the weather alert data come from?
All data is fetched live from the official api.weather.gov endpoint /alerts/active, which is free and does not require an API key.
How do I integrate this tool with Claude Desktop?
Add a server entry to claude_desktop_config.json with the uv run mcp run command pointing to your weather.py file. Restart Claude Desktop, then ask a weather-related question.
What are the core MCP primitives used?
The server implements a Tool (get_alerts), which is analogous to a POST endpoint. MCP also defines Resources (static data) and Prompts (reusable LLM templates), but this project focuses on a single tool.
Frequently asked questions
What runtime and dependencies are required?
Python 3.x with `uv` package manager, plus `mcp[cli]` and `httpx`. The project uses `uv.lock` for dependency locking.
How can I test the tool without Claude Desktop?
Run `uv run mcp dev server/weather.py` to launch the MCP Inspector at `http://localhost:6757`, where you can call `get_alerts` with a state code.
Where does the weather alert data come from?
All data is fetched live from the official [api.weather.gov](https://www.weather.gov/documentation/services-web-api) endpoint `/alerts/active`, which is free and does not require an API key.
How do I integrate this tool with Claude Desktop?
Add a server entry to `claude_desktop_config.json` with the `uv run mcp run` command pointing to your `weather.py` file. Restart Claude Desktop, then ask a weather-related question.
What are the core MCP primitives used?
The server implements a **Tool** (`get_alerts`), which is analogous to a POST endpoint. MCP also defines Resources (static data) and Prompts (reusable LLM templates), but this project focuses on a single tool.
Basic information
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