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0251c74109
Wind (NOAA GFS and ECMWF IFS: animated particles, colour field, a reading at map centre), observed weather (NOAA MRMS radar, GOES and NESDIS infrared clouds, lightning density) on one shared history timeline, NHC and CPHC cyclone advisories with tracks and cones, and a WEATHER panel in the right rail. On 3D Tiles the observed products render as raised shells with a sharper window around the view. Co-authored-by: Gustavo Beneduzi <[email protected]> Co-authored-by: Daniel Slay <[email protected]> Co-authored-by: Rehaan Delmotra <[email protected]> Co-authored-by: Cursor Agent <[email protected]>
35 lines
1.3 KiB
JavaScript
35 lines
1.3 KiB
JavaScript
export const GFS_BUCKET = 'noaa-gfs-bdp-pds';
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/** Build the public GFS object key. */
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export function gfsObjectKey({ date, hour, forecastHour = 0 }) {
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const hh = String(hour).padStart(2, '0');
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return `gfs.${date}/${hh}/atmos/gfs.t${hh}z.pgrb2.0p25.f${String(forecastHour).padStart(3, '0')}`;
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}
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/** Select the latest GFS cycle that should be available. */
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export function selectLatestGfsCycle(
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nowMs,
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{ availabilityLagMs = 5 * 3600_000 } = {},
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) {
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const d = new Date(nowMs - availabilityLagMs);
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const date = new Date(
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Date.UTC(d.getUTCFullYear(), d.getUTCMonth(), d.getUTCDate()),
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);
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const hour = Math.floor(d.getUTCHours() / 6) * 6;
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date.setUTCHours(hour);
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return { date: date.toISOString().slice(0, 10).replaceAll('-', ''), hour };
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}
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/**
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* Round a time offset to the nearest published GFS forecast step so the field
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* shown is the one valid closest to now, not always the analysis (f000).
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* GFS 0.25° is hourly through f120, then every 3 h through f384.
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* @param {number} hours - Hours elapsed since the cycle run time.
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* @returns {number} A valid forecast step.
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*/
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export function nearestGfsStep(hours) {
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const value = Math.max(0, Number.isFinite(hours) ? hours : 0);
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const step = value <= 120 ? Math.round(value) : Math.round(value / 3) * 3;
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return Math.max(0, Math.min(384, step));
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}
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