A Namibian thunderstorm, that is, which shot antimatter in the form of positrons off the planet recently.
Thunderstorms can shoot beams of antimatter into space—and the beams are so intense they can be spotted by spacecraft thousands of miles away, scientists have announced. [...]
Recently, radiation detectors on NASA’s Fermi Gamma-ray Space Telescope lighted up for about 30 milliseconds with the distinctive signature of positrons, the antimatter counterparts of electrons.
Scientists were able to trace the concentrated burst of radiation to a lightning flash over Namibia, at least 3,000 miles (5,000 kilometers) away from the Earth-orbiting telescope, which was passing above Egypt at the time.
If this were a Star Trek: Next Generation episode, they’d spend the first two acts getting “attacked” by antimatter beams, only to discover at the last moment before they reduce the planet’s surface to slag that there are beings from another dimension attempting to communicate through the beams. Then Wesley saves the day. ;)