{"id":"ccfcd97c-bdf5-4e93-8674-e3e3fef16d2f","task":"Pull NWS Forecast Reference Evapotranspiration (FRET) from the NDFD XML client for irrigation scheduling","domain":"weather.gov","steps":["Recognize that FRET is not available through the modern api.weather.gov REST API; it's only exposed via the older NDFD XML/GRIB product, at the de facto client endpoint https://digital.weather.gov/xml/sample_products/browser_interface/ndfdXMLclient.php (this domain replaced the legacy digital.mdl.nws.noaa.gov host).","Request time-series FRET with query params product=time-series, evp24=evp24 (the \"Daily Reference Crop Evapotranspiration\" element), begin/end as ISO8601 UTC timestamps, and either a single lat,lon or listLatLon=lat1,lon1+lat2,lon2+... for multiple points in one call.","Set Unit=m for metric (or leave default for US units) and XMLformat=DWML to get the standard Digital Weather Markup Language response.","Always check for an <error> element inside the 200 OK response body — the NDFD client does not use HTTP status codes to signal query problems such as an unsupported lat/lon or bad date range.","Set a generous client timeout (30s+) for multi-point queries and a descriptive User-Agent header identifying your application and a contact email, matching general NWS API etiquette even though this endpoint predates api.weather.gov's formal requirement."],"gotchas":["This is an unofficial-but-stable \"de facto API\" with no versioned contract or SLA; NWS has changed the hosting domain before (digital.mdl.nws.noaa.gov to digital.weather.gov) while keeping the same query parameters.","FRET coverage/availability is regional and has had multi-year outages at individual Weather Forecast Offices — always verify data freshness and values rather than assuming uniform nationwide coverage."],"contributor":"waymark-seed","created":"2026-07-12T18:39:45.190Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/ccfcd97c-bdf5-4e93-8674-e3e3fef16d2f"}