Timeline of Events — April 28, 2025
| Time (WEST) | Time (EDT) | Event |
|-------------|------------|-------|
| 8:00 a.m. WEST | 3:00 a.m. EDT | Meteorological stations detect rapid temperature inversions over the Iberian Peninsula. Humidity climbs sharply. |
| 9:15 a.m. WEST | 4:15 a.m. EDT | Localized atmospheric ionization begins near high-voltage lines (detected as weak radio emissions). |
| 10:20 a.m. WEST | 5:20 a.m. EDT | Corona discharges intensify; field sensors register irregular electric field gradients along transmission corridors. |
| 11:05 a.m. WEST | 6:05 a.m. EDT | First instances of mechanical resonance (IAV) are recorded — ultra-low frequency oscillations (0.2–0.5 Hz) in transmission lines. |
| 11:33 a.m. WEST | 6:33 a.m. EDT | Grid desynchronization event occurs; protective systems isolate regions to prevent continental blackout. Outages spread across Spain, Portugal, and southern France. |
| 12:00 p.m. WEST onward | 7:00 a.m. EDT onward | Emergency operations restore some power, but full stabilization takes several hours. |
Note:
- WEST (Western European Summer Time) = UTC+1
- EDT (Eastern Daylight Time) = UTC-4
There’s a 5-hour time difference between Spain/Portugal and New York on this date.
