It is already known that forest fires produce positively charged particles that rise into the air. You don't need big fires to create sprites, but maybe the positive electrical charges from fires are a link. Not long after the existence of sprites was verified, blue jets were found. A team of scientists from the University of Alaska was studying a massive hailstorm in Arkansas. Flying nearby, they saw rays of blue light discharging far above the tops of clouds.
Blue jets are very rare, though, and can barely be seen with the naked eye.
They may be linked to powerful hailstorms. These are the latest of the strange weather phenomena to be documented. Elves look like huge bluish or white disks or cone-shaped light coming from the top of a thunderstorm. Some grow to be 250 miles or more in diameter. They can extend 60 miles into the air.