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assets/js/events/weather-checks.js

@@ -116,11 +116,41 @@ export function checkHeatSpike(rows) {
 //   wet + calm   → rain icon (🌧️)
 //   windy + wet  → storm icon (🌩️), and the wind/rain icons are suppressed
 //                  for that hour so a single hour never shows two icons.
-const GUST_BLUSTERY = 25 / 2.237;   // m/s (= 25 mph) - matches the table's gust highlight
-const GUST_STORM    = 20;           // m/s ≈ 45 mph - storm-force
+const GUST_BLUSTERY = 25 / 2.237;   // m/s (= 25 mph) - Beaufort Force 6 threshold
+const GUST_STORM    = 20;           // m/s ≈ 45 mph - Beaufort Force 8+ threshold
 const PRECIP_WET    = 5;      // mm/h - meaningful rain
 const PRECIP_HEAVY  = 10;     // mm/h - heavy rain
 
+// Beaufort scale lookup - force number and name from gust speed in m/s
+function beaufortForce(ms) {
+  const mph = ms * 2.237;
+  if (mph >= 73) return { force: 12, name: 'Hurricane Force' };
+  if (mph >= 64) return { force: 11, name: 'Violent Storm' };
+  if (mph >= 55) return { force: 10, name: 'Storm Force' };
+  if (mph >= 47) return { force: 9,  name: 'Strong Gale' };
+  if (mph >= 39) return { force: 8,  name: 'Gale' };
+  if (mph >= 32) return { force: 7,  name: 'Near Gale' };
+  return            { force: 6,  name: 'Strong Breeze' };
+}
+
+const BEAUFORT_DESC = {
+  6:  'Large branches in motion; umbrellas used with difficulty.',
+  7:  'Whole trees in motion; inconvenience felt when walking against the wind.',
+  8:  'Twigs break off trees and generally impedes progress.',
+  9:  'Slight structural damage possible — chimney pots and slates at risk.',
+  10: 'Trees uprooted; considerable structural damage expected.',
+  11: 'Very rarely experienced inland; widespread damage expected.',
+  12: 'Devastating conditions — avoid all outdoor activity.',
+};
+
+// Banner colour scales with severity
+function windBannerColors(force) {
+  if (force >= 11) return { color: '#0c1020', textColor: '#c0d8ff' };
+  if (force >= 9)  return { color: '#101828', textColor: '#c0d4f0' };
+  if (force >= 7)  return { color: '#141e2e', textColor: '#c0d0e8' };
+  return                  { color: '#1a2030', textColor: '#c0d8f0' };
+}
+
 const gustOf   = r => r.gust ?? r.va ?? 0;
 const precipOf = r => r.precip ?? 0;
 const isWindyHour = r => { const g = gustOf(r);   return isFinite(g) && g >= GUST_BLUSTERY; };
@@ -135,20 +165,24 @@ export function checkWind(rows) {
 
   const maxGust = Math.max(...affected.map(gustOf).filter(isFinite));
   const mph = Math.round(maxGust * 2.237);
-  const isStorm = maxGust >= GUST_STORM;
+  const { force, name } = beaufortForce(maxGust);
+  const desc = BEAUFORT_DESC[force] || '';
+  const { color, textColor } = windBannerColors(force);
+
+  const title = force >= 10 ? `${name} Winds`
+              : force >= 8  ? `${name} Warning`
+              :               name;
 
   return {
     id: 'wind',
-    emoji: '💨',
-    title: isStorm ? 'Storm-Force Winds' : 'Blustery Conditions',
-    message: isStorm
-      ? `Storm-force gusts to ${mph} mph expected — secure loose objects and take care outdoors.`
-      : `Windy spell — gusts to ${mph} mph at peak. Hold onto hats and secure loose items outdoors.`,
-    color: '#1a2030',
-    textColor: '#c0d8f0',
+    emoji: force >= 10 ? '🌪️' : '💨',
+    title,
+    message: `Gusts to ${mph} mph (Beaufort Force ${force}). ${desc}`,
+    color,
+    textColor,
     type: 'weather',
     nightOnly: false,
-    isoRange,  // only show cell icon during the windy hours
+    isoRange,
   };
 }
 
@@ -185,20 +219,23 @@ export function checkStorm(rows) {
   const maxGust = Math.max(...affected.map(gustOf).filter(isFinite));
   const maxPrecip = Math.max(...affected.map(precipOf).filter(isFinite));
   const mph = Math.round(maxGust * 2.237);
-  const isSevere = maxGust >= GUST_STORM || maxPrecip >= PRECIP_HEAVY;
+  const { force, name } = beaufortForce(maxGust);
+  const { color, textColor } = windBannerColors(force);
+
+  const title = force >= 10 ? `${name} — Severe Storm`
+              : force >= 8  ? `${name} with Rain`
+              :               'Storm Conditions';
 
   return {
     id: 'storm',
     emoji: '🌩️',
-    title: isSevere ? 'Severe Storm' : 'Storm Conditions',
-    message: isSevere
-      ? `Severe storm — driving rain to ${maxPrecip.toFixed(1)} mm/h and gusts to ${mph} mph. Avoid travel if you can.`
-      : `Stormy spell — wind and rain together, gusts to ${mph} mph with ${maxPrecip.toFixed(1)} mm/h rain. Take care outdoors.`,
-    color: '#141a26',
-    textColor: '#c0d0e8',
+    title,
+    message: `Gusts to ${mph} mph (Beaufort Force ${force}) with ${maxPrecip.toFixed(1)} mm/h rain. ${BEAUFORT_DESC[force] || ''} Take care outdoors.`,
+    color,
+    textColor,
     type: 'weather',
     nightOnly: false,
-    isoRange,  // only show cell icon during the stormy hours
+    isoRange,
   };
 }