A plasma storm is a type of spatial disturbance that involves energetic particles in a state called plasma. Plasma storms are commonly found in places such as the Badlands. Plasma storms are relatively common occurrences.
While trying to figure out what had happened to a group of officers who encountered a Type 2 plasma storm on their way back to Deep Space 9, Doctor Julian Bashir did a search in the medical files about such a phenomenon and found 5,021 entries.
Professor Jennifer Sisko was working on a transpectral sensor array, a device that might be able to penetrate the plasma storms in an effort to find hidden Terran Rebellion bases in 2371 in the mirror universe. Sisko halted work on the device when she defected to the Rebellion after being persuaded to do so by Commander Benjamin Sisko. (DS9 episode: "Through the Looking Glass")