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3.8.2

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Fix event banner to use sunsoak for hot and air for frost
This commit is contained in:
fraxle
2026-08-02 16:55:48 +01:00
parent e721f27808
commit 249f284593
1 changed files with 17 additions and 13 deletions
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assets/js/events/weather-checks.js
+17 -13
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@@ -117,27 +117,31 @@ export function checkSunset(rows, location) {
};
}
// Thresholds are for plain shade/air temperature, not UTCI felt temperature,
// so they sit well below the UTCI Caution/Extreme/Danger bands
// (utils.js UTCI_BANDS). 27°C is the midpoint of the Met Office's official UK
// heatwave threshold (25°C in cooler regions to 28°C in the SE); 32°C and
// 38°C scale up from there, with 38°C sitting just under the UK's all-time
// record shade temperature of 40.3°C.
// Heat stress is what a body actually experiences, so this reads SunSoak
// (utciAdj — UTCI felt temperature with the precipitation penalty), not shade
// air temperature: standing in full sun at 24°C air is a real heat risk that
// an air-temp check misses entirely. Because the input is now on the UTCI
// scale, the thresholds are simply the UTCI_BANDS boundaries (utils.js):
// 27°C = Caution, 32°C = Extreme, 41°C = Danger. That keeps the banner's
// severity in lockstep with the band colour shown in the table and day tabs.
const HEAT_CAUTION = 27, HEAT_EXTREME = 32, HEAT_DANGER = 41;
const feltOf = r => r.utciAdj ?? r.utci ?? r.Ta;
export function checkHeatSpike(rows) {
const maxTemp = Math.max(...rows.map(r => r.Ta).filter(isFinite));
if (maxTemp < 27) return null;
const severity = maxTemp >= 38 ? 'danger' : maxTemp >= 32 ? 'extreme-caution' : 'caution';
const maxTemp = Math.max(...rows.map(feltOf).filter(isFinite));
if (maxTemp < HEAT_CAUTION) return null;
const severity = maxTemp >= HEAT_DANGER ? 'danger' : maxTemp >= HEAT_EXTREME ? 'extreme-caution' : 'caution';
// Only flag the hours that are actually at/above the heat threshold.
const affected = rows.filter(r => isFinite(r.Ta) && r.Ta >= 27);
const affected = rows.filter(r => { const t = feltOf(r); return isFinite(t) && t >= HEAT_CAUTION; });
const isoRange = affected.length
? [affected[0].iso, affected[affected.length - 1].iso]
: undefined;
const msgs = {
'caution': `Air temperature reaching ${maxTemp.toFixed(1)}°C. Avoid strenuous activity outdoors, drink plenty of fluids, and wear light clothing.`,
'extreme-caution': `Heat warning: Air temp ${maxTemp.toFixed(1)}°C expected today. Take frequent breaks indoors in the air conditioning, avoid strenuous activity, drink plenty of fluids, and wear light clothing.`,
'danger': `Extreme heat alert: Air temp ${maxTemp.toFixed(1)}°C forecast. Limit time spent outdoors and stay indoors with the air conditioning on as much as possible. Avoid strenuous activity, drink plenty of fluids, and wear light clothing.`,
'caution': `Feeling like ${maxTemp.toFixed(1)}°C in the sun. Avoid strenuous activity outdoors, drink plenty of fluids, and wear light clothing.`,
'extreme-caution': `Heat warning: feeling like ${maxTemp.toFixed(1)}°C in the sun today. Take frequent breaks indoors in the air conditioning, avoid strenuous activity, drink plenty of fluids, and wear light clothing.`,
'danger': `Extreme heat alert: feeling like ${maxTemp.toFixed(1)}°C in the sun. Limit time spent outdoors and stay indoors with the air conditioning on as much as possible. Avoid strenuous activity, drink plenty of fluids, and wear light clothing.`,
};
return {
id: 'heat-spike',