get_alerts
Retrieve active weather alerts for any US state using the National Weather Service API to monitor severe conditions and stay informed.
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:37-54 (handler)Main handler function for the 'get_alerts' tool. Registered via @mcp.tool() decorator. Takes a US state code, fetches active alerts from NWS API, handles errors, formats output using helper functions.
@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:12-24 (helper)Helper function to make HTTP requests to NWS API with headers, timeout, and error handling. Used by get_alerts.
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 - weather.py:26-35 (helper)Helper function to format a single alert feature into a human-readable string. Used in get_alerts for each alert.
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:37-37 (registration)Registration of the get_alerts tool via the FastMCP @tool decorator.
@mcp.tool() - weather.py:39-43 (schema)Input schema defined in the tool's docstring: parameter 'state' as two-letter US state code.
"""Get weather alerts for a US state. Args: state: Two-letter US state code (e.g. CA, NY) """