Live 7-day surf forecast for a surf town and each of its spots, rated hour by hour for that spot (rating Flat, Poor, Fair, Good, Great or Epic with a 0–10 score and the reasons why, from the way the spot's coast faces, the swell trains, their period and the wind against the coast): per day the rating, the best time window (best.from–best.to, local time, which already accounts for the tide), what to expect in surfers' words (body: 'Chest to head high', surface: Glassy/Clean/Fair/Bumpy/Choppy/Blown out), breaking surf height (surf [min, max] m), wave height range, swell height, period and direction, wind, high and low tides with heights (predicted from the nearest tide gauge: see tide, or approximate from the ocean model where there is none), sunrise/sunset, water temperature (the ocean model's, set to the newest satellite measurement at the town: water says how, with source 'satellite' and the satellite's day, 'climate' when only this month's measured difference was used, or 'model'; months: the measured mean by month) and confidence (high/medium/low: three wave models compared, ECMWF, Météo-France and NOAA, with their figures in models; a model the town's buoy has shown to be far off there is left out), and, when the models differ on a day's size by 20% or more, range (wave [min, max] m at sea, surf [min, max] m at the spot, body in surfers' words); the town's days name the best spot (bestSpot). accuracy, where the town has a buoy (NOAA, Queensland Government, E.U. Copernicus Marine or Israel Oceanographic & Limnological Research): how often the forecast was within 20% of it over the last weeks, whether sizes are corrected for the model's bias there (method 'ratio', or 'power' with fit { k, beta }: the correction depends on size), at which spots (correctedSpots: those facing the same sea as the buoy), the swell period's record and correction (period: within15 is the share of hours within 1.5 s, offset the seconds added), each wave model's own record at the buoy (models: { n, mae, within20 }), the closest one (bestModel) and the ones left out of the confidence check (unreliable). offshore, for every town: the open water off the town checked against the satellite altimeters' passes (Copernicus Marine, within 100 km; passes, km, from/to, within20 and within20Raw, ratio satellite ÷ model, corrected: whether sizes here are scaled by it, which happens only where no buoy correction applies, models/bestModel/unreliable offshore, and the credit line to show). updated says when the forecast was worked out (it is cached for up to 3 hours). Plus the next 48 hours every 3 hours, now (rating, why, tide rising/falling, and water: this hour's sea temperature in °C, set to the satellites like the days'; trust it as measured only where water.source is 'satellite' or 'climate', as the town page does) and live: what the nearest buoy or wave station, the newest satellite altimeter pass near the town (satellite: mission, time, km out, wave height, and what the model said there and then) and the airport wind report (METAR) measure right now, checked against the forecast (check: on-track, bigger/smaller, windier/calmer; check.factor is the nudge applied to today's sizes, from the buoy, or from the satellite where there is no buoy). When it is not 1, nowcast says so and today's surf and body (now, hours, today's day) are already scaled toward the measurement, as on the site; ratings stay the model's. Waves from Open-Meteo Marine, wind from MET Norway.