British meteorologists say up to 20,000 lightning strikes hit the UK during a powerful overnight thunderstorm, reports the AP, and a London-area airport is reporting flight disruptions after an aircraft refueling system was damaged. London Stansted Airport said Sunday that a lightning strike had rendered the fueling system "unavailable for a period this morning. Engineers have been on site and have now restored the system, however flights may still be subject to diversion, delay or cancellation." Britain is in the middle of a holiday weekend, and budget airline Ryanair couldn't say how many flights had been affected at the airport, but was offering full refunds to some. Meteorologist Charlie Powell said information suggested there were "somewhere between 15,000 and 20,000 strikes across the UK during the overnight period;" the BBC says 15,000 strikes were recorded in a four-hour period. The Express quotes a meteorologist who calls it "the mother of all thunderstorms." (More severe weather stories.)