get_alerts
Retrieve weather alerts for any US state by providing its two-letter code to monitor hazardous conditions and stay informed about local weather warnings.
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 |
Output Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| result | Yes |
Implementation Reference
- weather.py:174-192 (handler)The main handler function for the 'get_alerts' tool. It fetches active weather alerts for a given US state using the National Weather Service (NWS) API, formats them using the format_alert helper, and returns a concatenated string of alerts. The @mcp.tool() decorator registers this function as an MCP tool.
@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) """ print(f"get_alerts called with state: {state}", file=sys.stderr) 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:56-65 (helper)Helper function used by get_alerts to format each alert feature into a human-readable multi-line string.
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:24-38 (helper)Helper function used by get_alerts to make HTTP requests to the NWS API with error handling.
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 as e: print(f"NWS API error: {e}", file=sys.stderr) return None