get-forecast
Retrieve accurate weather forecasts for any location by providing latitude and longitude coordinates. Simplify weather data access for informed decision-making.
Instructions
Get weather forecast for a location
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| latitude | Yes | Latitude of the location | |
| longitude | Yes | Longitude of the location |
Implementation Reference
- src/index.ts:134-214 (handler)The core handler logic for the 'get-forecast' tool. Fetches forecast data from the National Weather Service API using latitude and longitude, formats the forecast periods, and returns a structured text response.async ({ latitude, longitude }) => { // Get grid point data const pointsUrl = `${NWS_API_BASE}/points/${latitude.toFixed( 4 )},${longitude.toFixed(4)}`; const pointsData = await makeNWSRequest<PointsResponse>(pointsUrl); if (!pointsData) { return { content: [ { type: "text", text: `Failed to retrieve grid point data for coordinates: ${latitude}, ${longitude}. This location may not be supported by the NWS API (only US locations are supported).`, }, ], }; } const forecastUrl = pointsData.properties?.forecast; if (!forecastUrl) { return { content: [ { type: "text", text: "Failed to get forecast URL from grid point data", }, ], }; } // Get forecast data const forecastData = await makeNWSRequest<ForecastResponse>(forecastUrl); if (!forecastData) { return { content: [ { type: "text", text: "Failed to retrieve forecast data", }, ], }; } const periods = forecastData.properties?.periods || []; if (periods.length === 0) { return { content: [ { type: "text", text: "No forecast periods available", }, ], }; } // Format forecast periods const formattedForecast = periods.map((period: ForecastPeriod) => [ `${period.name || "Unknown"}:`, `Temperature: ${period.temperature || "Unknown"}°${ period.temperatureUnit || "F" }`, `Wind: ${period.windSpeed || "Unknown"} ${period.windDirection || ""}`, `${period.shortForecast || "No forecast available"}`, "---", ].join("\n") ); const forecastText = `Forecast for ${latitude}, ${longitude}:\n\n${formattedForecast.join( "\n" )}`; return { content: [ { type: "text", text: forecastText, }, ], }; }
- src/index.ts:126-133 (schema)Zod schema defining the input parameters for the 'get-forecast' tool: latitude and longitude as numbers within valid geographic ranges.{ latitude: z.number().min(-90).max(90).describe("Latitude of the location"), longitude: z .number() .min(-180) .max(180) .describe("Longitude of the location"), },
- src/index.ts:123-125 (registration)Registration of the 'get-forecast' tool on the MCP server, specifying name, description, input schema, and handler function.server.tool( "get-forecast", "Get weather forecast for a location",
- src/tools/weather.ts:4-20 (helper)Utility function 'makeNWSRequest' used by the get-forecast handler to perform API requests to the NWS with appropriate headers and error handling.export async function makeNWSRequest<T>(url: string): Promise<T | null> { const headers = { "User-Agent": USER_AGENT, Accept: "application/geo+json", }; try { const response = await fetch(url, { headers }); if (!response.ok) { throw new Error(`HTTP error! status: ${response.status}`); } return (await response.json()) as T; } catch (error) { console.error("Error making NWS request:", error); return null; } }