{"about":"High and low water, sea level and wave height at Cascais, the Tagus and Funchal, yesterday to tomorrow (UTC). A model, not Instituto Hidrográfico's official tide table and not a warning: IPMA issues the coastal warnings (Agitação Marítima) and the Captaincies close bars and beaches.","label":"evidence: a model (Open-Meteo Marine API), turns found by us","source":"https://marine-api.open-meteo.com/v1/marine?latitude=38.68&longitude=-9.42&hourly=sea_level_height_msl,wave_height,wave_period&timezone=GMT&start_date=2026-11-10&end_date=2026-11-12","source_name":"Open-Meteo Marine API (sea_level_height_msl, wave_height, wave_period)","licence":"CC BY 4.0 (Open-Meteo; underlying ocean models credited by Open-Meteo)","read_utc":"2026-11-11T11:52:44Z","method":"Hourly sea level relative to mean sea level at the model sea cell nearest each place; a high or low water is an hourly turn, refined by a parabola through the three hours around it (to about 10 minutes and a few cm). Heights are above or below MEAN SEA LEVEL, not above the chart datum used in IH's tables (so they are not comparable number for number with a printed tide table). The Lisbon cell is the nearest sea cell outside the estuary, not the Lisbon tide gauge: estuary times run later.","confidence":"MEDIUM for times of high and low water at Cascais and Funchal (astronomical tide well modelled); LOW for Lisbon inside the estuary; storm surge in the model is not verified against a gauge.","official_source":{"name":"Instituto Hidrográfico, Tabela de Marés 2026 (Lisboa, Cascais, Funchal)","url":"https://www.hidrografico.pt/en/generic-pages/dt/doc/oceanographic-forecast/?child=mare-height","access":"digital only, through IH's online shop (loja.hidrografico.pt): needs an account; not read by us"},"by":"incident.datascience@web-summit.dinis","updated":"2026-11-11T11:52:44Z","places":[{"id":"cascais","name":"Cascais (Tagus 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