feat(fires): flag possible explosions in satellite thermal detections (#2850)

* feat(fires): flag possible explosions in satellite thermal detections

Adds possibleExplosion field (FRP >80 MW + brightness >380 K) to fire
detections, surfacing non-fire thermal signatures that may indicate
strikes or explosions. Seeder computes the flag, panel shows inline
badge per region and summary alert when explosions are detected.

* refactor(fires): extract brightness/frp locals to avoid double-parse

docs/api/WildfireService.openapi.yaml

@@ -202,6 +202,11 @@ components:
                 dayNight:
                     type: string
                     description: Day or night detection ("D" or "N").
+                possibleExplosion:
+                    type: boolean
+                    description: |-
+                        Whether the thermal signature suggests a possible explosion rather than a fire
+                         (FRP > 80 MW and brightness > 380 K).
             required:
                 - id
             description: FireDetection represents a satellite-detected active fire from NASA FIRMS.

proto/worldmonitor/wildfire/v1/fire_detection.proto

@@ -30,6 +30,9 @@ message FireDetection {
   string region = 8;
   // Day or night detection ("D" or "N").
   string day_night = 9;
+  // Whether the thermal signature suggests a possible explosion rather than a fire
+  // (FRP > 80 MW and brightness > 380 K).
+  bool possible_explosion = 10;
 }
 
 // FireConfidence represents the confidence level of a fire detection.

scripts/seed-fire-detections.mjs

@@ -78,19 +78,22 @@ async function fetchAllRegions(apiKey) {
           if (seen.has(id)) continue;
           seen.add(id);
           const detectedAt = parseDetectedAt(row.acq_date || '', row.acq_time || '');
+          const brightness = parseFloat(row.bright_ti4 ?? '0') || 0;
+          const frp = parseFloat(row.frp ?? '0') || 0;
           fireDetections.push({
             id,
             location: {
               latitude: parseFloat(row.latitude ?? '0') || 0,
               longitude: parseFloat(row.longitude ?? '0') || 0,
             },
-            brightness: parseFloat(row.bright_ti4 ?? '0') || 0,
-            frp: parseFloat(row.frp ?? '0') || 0,
+            brightness,
+            frp,
             confidence: mapConfidence(row.confidence || ''),
             satellite: row.satellite || '',
             detectedAt,
             region: regionName,
             dayNight: row.daynight || '',
+            possibleExplosion: frp > 80 && brightness > 380,
           });
         }
       } catch (err) {

src/components/SatelliteFiresPanel.ts

@@ -43,8 +43,11 @@ export class SatelliteFiresPanel extends Panel {
         ? `${(s.totalFrp / 1000).toFixed(1)}k`
         : Math.round(s.totalFrp).toLocaleString();
       const highClass = s.highIntensityCount > 0 ? ' fires-high' : '';
+      const explosionBadge = s.possibleExplosionCount > 0
+        ? `<span class="fires-explosion-badge" title="${t('components.satelliteFires.explosionTooltip')}">${s.possibleExplosionCount}</span>`
+        : '';
       return `<tr class="fire-row${highClass}">
-        <td class="fire-region">${escapeHtml(s.region)}</td>
+        <td class="fire-region">${escapeHtml(s.region)}${explosionBadge}</td>
         <td class="fire-count">${s.fireCount}</td>
         <td class="fire-hi">${s.highIntensityCount}</td>
         <td class="fire-frp">${frpStr}</td>
@@ -53,6 +56,7 @@ export class SatelliteFiresPanel extends Panel {
 
     const totalFrp = this.stats.reduce((sum, s) => sum + s.totalFrp, 0);
     const totalHigh = this.stats.reduce((sum, s) => sum + s.highIntensityCount, 0);
+    const totalExplosions = this.stats.reduce((sum, s) => sum + s.possibleExplosionCount, 0);
     const ago = this.lastUpdated ? timeSince(this.lastUpdated) : t('components.satelliteFires.never');
 
     this.setContent(`
@@ -76,6 +80,7 @@ export class SatelliteFiresPanel extends Panel {
             </tr>
           </tfoot>
         </table>
+        ${totalExplosions > 0 ? `<div class="fires-explosion-alert">${t('components.satelliteFires.possibleExplosions', { count: String(totalExplosions) })}</div>` : ''}
         <div class="fires-footer">
           <span class="fires-source">NASA FIRMS (VIIRS SNPP)</span>
           <span class="fires-updated">${ago}</span>

src/generated/client/worldmonitor/wildfire/v1/service_client.ts

@@ -28,6 +28,7 @@ export interface FireDetection {
   detectedAt: number;
   region: string;
   dayNight: string;
+  possibleExplosion: boolean;
 }
 
 export interface GeoCoordinates {

src/generated/server/worldmonitor/wildfire/v1/service_server.ts

@@ -28,6 +28,7 @@ export interface FireDetection {
   detectedAt: number;
   region: string;
   dayNight: string;
+  possibleExplosion: boolean;
 }
 
 export interface GeoCoordinates {

src/locales/en.json

@@ -1647,7 +1647,9 @@
         "minutesAgo": "{{count}}m ago",
         "hoursAgo": "{{count}}h ago"
       },
-      "infoTooltip": "NASA FIRMS VIIRS satellite thermal detections across monitored conflict regions. High-intensity = brightness >360K & confidence >80%."
+      "infoTooltip": "NASA FIRMS VIIRS satellite thermal detections across monitored conflict regions. High-intensity = brightness >360K & confidence >80%.",
+      "possibleExplosions": "{{count}} possible explosion(s) detected",
+      "explosionTooltip": "Thermal signature consistent with explosion (FRP >80 MW, brightness >380 K)"
     },
     "ucdpEvents": {
       "stateBased": "State-Based",

src/services/wildfires/index.ts

@@ -18,6 +18,7 @@ export interface FireRegionStats {
   fireCount: number;
   totalFrp: number;
   highIntensityCount: number;
+  possibleExplosionCount: number;
 }
 
 export interface FetchResult {
@@ -74,12 +75,14 @@ export function computeRegionStats(regions: Record<string, FireDetection[]>): Fi
     const highIntensity = fires.filter(
       f => f.brightness > 360 && f.confidence === 'FIRE_CONFIDENCE_HIGH',
     );
+    const possibleExplosions = fires.filter(f => f.possibleExplosion);
     stats.push({
       region,
       fires,
       fireCount: fires.length,
       totalFrp: fires.reduce((sum, f) => sum + (f.frp || 0), 0),
       highIntensityCount: highIntensity.length,
+      possibleExplosionCount: possibleExplosions.length,
     });
   }
 

src/styles/panels.css

@@ -140,6 +140,29 @@
   font-weight: 600;
 }
 
+.fires-explosion-badge {
+  display: inline-block;
+  margin-left: 6px;
+  padding: 1px 5px;
+  border-radius: 8px;
+  background: var(--threat-critical);
+  color: var(--bg);
+  font-size: 10px;
+  font-weight: 700;
+  line-height: 1.4;
+  vertical-align: middle;
+}
+
+.fires-explosion-alert {
+  padding: 6px 8px;
+  margin-top: 4px;
+  border-radius: 4px;
+  background: color-mix(in srgb, var(--threat-critical) 12%, transparent);
+  color: var(--threat-critical);
+  font-size: 11px;
+  font-weight: 600;
+}
+
 .fires-footer {
   display: flex;
   justify-content: space-between;