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Lookup a weather.gov grid by lat, lon

Documentation: https://www.weather.gov/documentation/services-web-api

Forecasts are created at each NWS Weather Forecast Office (WFO) on their own grid definition, at a resolution of about 2.5km x 2.5km. The API endpoint for the 12h forecast periods at a specific grid location is formatted as:

https://api.weather.gov/gridpoints/{office}/{gridX},{gridY}/forecast

For example: https://api.weather.gov/gridpoints/TOP/31,80/forecast

To obtain the grid forecast for a point location, use the /points endpoint to retrieve the current grid forecast endpoint by coordinates:

https://api.weather.gov/points/{latitude},{longitude}

For example: https://api.weather.gov/points/39.7456,-97.0892

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import { fetchJSON } from "https://esm.town/v/stevekrouse/fetchJSON";
export function weatherGovGrid({ lat, lon }): Promise<WeatherData> {
return fetchJSON(
`https://api.weather.gov/points/${lat},${lon}`,
);
}
interface Coordinate {
type: string;
coordinates: [
number,
number,
];
}
interface Distance {
unitCode: string;
value: number;
}
interface Bearing {
unitCode: string;
value: number;
}
interface RelativeLocation {
type: string;
geometry: Coordinate;
properties: {
city: string;
state: string;
distance: Distance;
bearing: Bearing;
};
}
interface Properties {
"@id": string;
"@type": string;
cwa: string;
forecastOffice: string;
gridId: string;
gridX: number;
gridY: number;
forecast: string;
forecastHourly: string;
forecastGridData: string;
observationStations: string;
relativeLocation: RelativeLocation;
forecastZone: string;
county: string;
fireWeatherZone: string;
timeZone: string;
radarStation: string;
}
interface WeatherData {
id: string;
type: string;
geometry: Coordinate;
properties: Properties;
}
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v4
October 23, 2023