KPI range bars: shaded segment shows minimum–maximum in the selected chart window; dark dot is the current or replay reading. Wind, gust and DELTA have a zero baseline. Weather ranges use observations only, excluding forecasts; tide uses predictions across the selected window. Missing values are excluded. Direction keeps its compass because bearings wrap around north.
Pale-blue forecast area: hourly rain probability (%) from the wind/tide zero baseline, behind wind bars. Read it on the right numeric axis: 75 means 75% for rain, not 75 knots. Hover for exact probability. Missing probabilities remain gaps; 0% stays at zero. Only future forecast periods are shown. Tail replay holds the current forecast in place; it does not show historical forecasts.
Orange: pressure · pale blue: signed six-minute pressure change · dark blue: pressure + tide height · gray dots: pressure tail · purple dots: cumulative feather on its own centered scale. Both fade toward their older ends.
Wind < 8Wind ≥ 8DELTA < 5DELTA 5–<10DELTA 10–15DELTA > 15
Green wind + colored DELTA = gust, drawn in front of the tide. Lower tide uses its actual height: 6 ft reaches 6 on the shared numeric scale. Dark blue marks 11:00–18:00 on your local clock. Gray band: 10–39 kn; reference line: 15 kn. Pressure MIN/MAX use only this view’s readings.
How the layers share one plotting area
Lower layers: display coordinate = 960 + wind (kn) or tide (ft). Upper blue line: pressure (mb) + tide height (ft), so zero tide touches the orange pressure line. These are visual offsets, not physical unit conversions. The left scale reads pressure; the right scale reads lower wind/tide values.
Daily tails: anchor pressure + accumulated pressure change. The default consecutive-change formula simplifies to anchor pressure − the older reading; each tail ends on its day’s orange pressure value. Each day anchors at the same local clock time, looking back 24 hours. Dots every 30 minutes; missing readings stop a tail. The purple feather sums anchor minus every prior reading. It uses a separate centered zero line and one symmetric scale calculated from all possible 24-hour anchor windows in the displayed history. That scale stays fixed through replay and across days; it is not the pressure axis. Hover gives raw sums. Neither tail changes the main axis range. Both formulas remain drafts for comparison with Domo.
Rocker reverses at the ends; Repeat keeps the cycle going. 2× advances 12 minutes per frame; 4× advances 24 minutes; 8× advances 48 minutes; 16× advances 96 minutes. Playback slows if rendering needs more time. Only the tails move during replay. Axes, observations, KPIs, and the current forecast remain fixed until Back to live. Each daily tail recalculates its preceding 24 hours. Missing readings stay missing.
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