MCP Servers

Weather MCP Server

Provides weather forecasts and alerts for US locations using the National Weather Service API. Enables users to retrieve active alerts by state and detailed forecasts by coordinates via MCP tools.

README

Weather MCP Server

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

Features

Weather Alerts — Retrieve active NWS weather alerts for any US state
Weather Forecast — Get a detailed forecast for any US location by latitude/longitude
Weather Briefing Prompt — A pre-built prompt that combines alerts and forecast into a comprehensive briefing

Prerequisites

Node.js v18 or later
An MCP-compatible client (e.g. Claude Desktop)

Note: The NWS API only supports locations within the United States.

Installation

npm install
npm run build

Usage

Run the server directly via stdio (the standard MCP transport):

node build/index.js

Or use the weather bin alias after a global/local install:

npx weather

Integrating with Claude Desktop

Add the following to your claude_desktop_config.json:

{
  "mcpServers": {
    "weather": {
      "command": "node",
      "args": ["/absolute/path/to/mcp-poc/build/index.js"]
    }
  }
}

Tools

`get_alerts`

Retrieves active weather alerts for a US state.

Parameter	Type	Description
`state`	string	Two-letter state code (e.g. `CA`, `NY`)

`get_forecast`

Retrieves the weather forecast for a specific US location.

Parameter	Type	Description
`latitude`	number	Latitude of the location (-90–90)
`longitude`	number	Longitude of the location (-180–180)

Prompts

`weather-briefing`

Generates a comprehensive weather briefing for a US state.

Argument	Type	Description
`state`	string	Two-letter US state code (e.g. `CA`, `NY`)
`latitude`	string	Latitude of a location within the state for the forecast
`longitude`	string	Longitude of a location within the state for the forecast

Development

# Build TypeScript
npm run build

# Source files
src/index.ts    # MCP server, tools, and prompts
src/helpers.ts  # NWS API client and shared types

License

ISC

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