// --- DATA SOURCE / ACCURACY / PRECISION REFERENCE (Weather Page) --- // Mirrors the same system used on the Planning page: one central place // describing where every live figure on this page comes from, so every // "i" info icon reads from the same information and stays consistent if a // provider ever changes. const DATA_SOURCE_INFO = { weatherConditions: { label: "Live Weather & Forecast", source: "Open-Meteo (blending UK Met Office UKV 2km model for UK/Ireland with ECMWF globally), automatically falling back through wttr.in and MET Norway if unavailable.", accuracy: "Typically accurate to within roughly ±1-2°C for temperature and ±10-20% for cloud cover over the next 0-48 hours; accuracy falls the further ahead you look.", precision: "Hourly figures for today, daily max/min for the extended forecast, all for your exact dropped-pin location.", updates: "Refetched whenever you move the pin; underlying models refresh hourly (UKV) to every 6 hours (ECMWF) at source.", caveats: "A forecast model, not a measurement - treat it as strong guidance, especially beyond 2-3 days out." }, spaceWeather: { label: "Live Solar Wind & Aurora (Kp-Index)", source: "NOAA Space Weather Prediction Center's real-time solar wind (magnetometer + plasma, updated every ~1 minute) and 3-hourly planetary Kp forecast, automatically falling back to GFZ Potsdam's official Kp nowcast if NOAA's forecast feed goes stale.", accuracy: "Real-time solar wind readings (Bz, Speed, Density) are direct satellite measurements, not a forecast, so they're accurate to the instrument - but they describe conditions right now, roughly 30-60 minutes before any resulting aurora reaches Earth. The Kp forecast itself is genuinely reliable roughly 12-36 hours ahead; confidence drops off sharply further out.", precision: "Solar wind updates roughly every 1 minute; Kp forecast in 3-hourly steps, compared against a threshold calibrated to your latitude.", updates: "Solar wind polled continuously while this page is open; Kp forecast refreshes roughly every 3 hours at source.", caveats: "Geomagnetic storms are hard to predict precisely more than a day or two out. Whether you'll actually see anything also depends on local cloud cover and light pollution." }, tide: { label: "Tide Times", source: "UK Admiralty (UKHO) official tidal predictions where available, falling back to TideCheck's verified station data, and finally to a single-harmonic estimate if neither covers your location.", accuracy: "UKHO predictions are the official government-grade standard for UK waters. The single-harmonic fallback (used only when no proper station is nearby) is a rough approximation and can be off by up to an hour.", precision: "To the nearest minute at the named reference station or port; accuracy naturally decreases the further your dropped pin is from that station.", updates: "Fetched fresh for your exact location each time you move the pin.", caveats: "Always marked in the app as Official, Verified, or Est. so you can see at a glance which kind of prediction you're looking at - for anything safety-critical, cross-check with ADMIRALTY EasyTide." }, marine: { label: "Sea State (Wave Height, Period & Swell)", source: "Open-Meteo's Marine Weather API, blending wave/swell model data from meteorological agencies including the UK Met Office and ECMWF.", accuracy: "Generally reliable for open-water forecasting 0-48 hours out, in the same range as the underlying weather model accuracy. Coastal/harbour conditions can differ from the open-water figures shown here due to local sheltering, headlands, and shallow-water effects.", precision: "Hourly wave height, period, direction and swell height, for your exact dropped pin - only available over open water, so this card simply won't appear for inland locations.", updates: "Fetched alongside the rest of the weather data whenever you move the pin.", caveats: "This is forecast guidance, not a substitute for an official marine forecast or a skipper's own judgement before sailing - always follow harbour authority and Coastguard advice for anything safety-critical." }, lightning: { label: "Lightning Strikes", source: "Precise strikes (dashed circle around your last tap) from Xweather's professional detection network. Broader haze/activity layers from EUMETSAT's satellite Lightning Imager (Europe/Africa/parts of S. America) and NOAA's ground-network density product (Americas, Asia, Pacific).", accuracy: "Xweather's ground-network strikes are individually located and generally accurate to within a few hundred metres to a few kilometres. The satellite haze layers show broad regional activity, not individual strike locations.", precision: "Precise strikes shown for a fixed radius around your last tapped point; the rolling Replay view covers the past 60 minutes for the Northumberland area specifically.", updates: "Precise strikes are polled on a short interval while lightning mode is active; the satellite layers update roughly every 5-15 minutes at source.", caveats: "Not the same underlying data as consumer sites like Blitzortung/lightningmaps.org - Xweather's terms don't allow using their feed that way, so a professional network is used instead." }, radar: { label: "Rain Radar & Satellite", source: "RainViewer's composite radar/nowcast mosaic, plus RainViewer and EUMETSAT infrared satellite imagery for cloud cover.", accuracy: "Radar accuracy is generally good for tracking existing rain in real time; the short-range nowcast portion (future frames) is an extrapolation and becomes less reliable more than ~30-60 minutes ahead.", precision: "Tiled imagery refreshed at roughly 10-minute intervals for radar, and 5-15 minute intervals for satellite depending on provider.", updates: "New frames are pulled automatically while the radar/satellite layer is active.", caveats: "Radar can miss very light rain/snow and can be affected by hills blocking the radar beam in some areas." }, holyIsland: { label: "Holy Island Causeway Crossing Times", source: "Officially published safe crossing times, scraped daily from the Northumberland County Council causeway crossing times page.", accuracy: "As accurate as the official published schedule itself - this app doesn't calculate independent tide predictions for the causeway, it reads the same table the council publishes.", precision: "To the nearest 5 minutes, matching the source table's own resolution.", updates: "Re-scraped once daily by an automated job; the app also checks the scraped date genuinely matches today before showing it as current.", caveats: "Always a safety-critical crossing - if this data ever looks stale or unavailable, the app tells you to check the official site directly rather than guessing." } }; // Small reusable "i" icon + detail card, used throughout the weather page to // explain exactly where a given live figure comes from and how much to // trust it. Renders via a React portal straight into , so it always // appears as a fully readable, correctly positioned card - centred on // desktop, a bottom sheet on mobile - regardless of which panel it's // triggered from or whether that panel uses backdrop-blur (which would // otherwise trap a plain `position:fixed` popover inside the panel's own // bounds instead of the real viewport). // // `id` selects which DATA_SOURCE_INFO entry to display. `tipKey` is the // state key used to track open/closed - defaults to `id`, but MUST be given // a unique value if the same `id` is used more than once within the same // component, so multiple icons don't all pop open together. const SourceInfoTip = ({ id, tipKey, activeInfoTip, setActiveInfoTip }) => { const info = DATA_SOURCE_INFO[id]; if (!info) return null; const key = `source:${tipKey || id}`; const isOpen = activeInfoTip === key; return ( {isOpen && ReactDOM.createPortal(
setActiveInfoTip(null)} >
e.stopPropagation()} >

{info.label}

Source {info.source}
Accuracy {info.accuracy}
Precision {info.precision}
Updates {info.updates}
{info.caveats && (
{info.caveats}
)}
, document.body )} ); };