get_alerts
Fetch real-time weather alerts for any US state using two-letter state codes. Access official National Weather Service warnings for severe weather conditions.
Instructions
Get weather alerts for a US state.
Args:
state: Two-letter US state code (e.g. CA, NY)Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| state | Yes |
Implementation Reference
- weather.py:44-61 (handler)Main implementation of the get_alerts tool. Fetches weather alerts from the NWS API for a given US state code, processes the response, and formats alerts into readable strings.
@mcp.tool() async def get_alerts(state: str) -> str: """Get weather alerts for a US state. Args: state: Two-letter US state code (e.g. CA, NY) """ url = f"{NWS_API_BASE}/alerts/active/area/{state}" data = await make_nws_request(url) if not data or "features" not in data: return "Unable to fetch alerts or no alerts found." if not data["features"]: return "No active alerts for this state." alerts = [format_alert(feature) for feature in data["features"]] return "\n---\n".join(alerts) - weather.py:44-44 (registration)The @mcp.tool() decorator registers get_alerts as an MCP tool with the FastMCP server. The schema is auto-generated from the function signature and docstring.
@mcp.tool() - weather.py:32-41 (helper)Helper function that formats an individual alert feature from the NWS API into a human-readable string with event type, area, severity, description, and instructions.
def format_alert(feature: dict) -> str: """Format an alert feature into a readable string.""" props = feature["properties"] return f""" Event: {props.get('event', 'Unknown')} Area: {props.get('areaDesc', 'Unknown')} Severity: {props.get('severity', 'Unknown')} Description: {props.get('description', 'No description available')} Instructions: {props.get('instruction', 'No specific instructions provided')} """ - weather.py:17-30 (helper)Helper function that makes HTTP requests to the NWS API with proper headers and error handling. Used by get_alerts to fetch alert data.
#helper function async def make_nws_request(url: str) -> dict[str, Any] | None: """Make a request to the NWS API with proper error handling.""" headers = { "User-Agent": USER_AGENT, "Accept": "application/geo+json" } async with httpx.AsyncClient() as client: try: response = await client.get(url, headers=headers, timeout=30.0) response.raise_for_status() return response.json() except Exception: return None