The Black Sea creates a distinctive microclimate along the Bulgarian coast. During summer, the warm sea surface heats the overlying air mass, creating instability that produces rapid thunderstorm development — particularly in the afternoon and early evening hours when solar heating peaks.
These storms can materialise with startling speed. A clear morning sky can transform into towering cumulonimbus clouds producing intense lightning, dangerous wind shear, heavy rain, and even hail within 30 to 45 minutes. When a storm cell passes directly over the airport, flights are suspended until conditions improve.
However, there is a critical legal distinction that airlines hope passengers do not understand: routine seasonal weather is not an extraordinary circumstance. These afternoon thunderstorms occur with predictable regularity every summer along the entire Black Sea coast. Airlines that have operated charter programmes from Burgas for five, ten, or twenty years cannot credibly claim that a July thunderstorm was unforeseeable.
European courts have consistently held that foreseeable seasonal weather patterns do not qualify as extraordinary circumstances. If the airline could have built buffer time into its schedule, positioned reserve aircraft, or arranged alternative routing, the weather defence fails.
When Weather Defences Do and Do Not Work
| Scenario | Extraordinary? | Your Claim |
|---|
| Brief afternoon thunderstorm (30-60 min) that other airlines flew through | No | Strong claim |
| Multi-hour severe storm with airport-wide ground stop | Possibly | Depends on airline response |
| Routine summer convective weather causing 4+ hour delay | No | Strong claim — foreseeable |
| Unprecedented weather event (rare hurricane-force wind) | Yes | Likely blocked |
| Storm cleared 3 hours before your delayed departure | No | Very strong claim |
