Lightning among storm clouds.
Lightning is an electrical phenomena that is seen on several planets, including Earth. It is associated with thunderstorms and other phenomena, such as a volcanic eruptions.
On Vulcan, a sand fire emits lightning-like bolts of electricity. Arev was killed by a lightning discharge from a sand fire in 2154. (ENT: "The Forge")
Lieutenant Kaplan was killed by a lightning bolt, produced by Vaal, during a mission to Gamma Trianguli VI in 2267. Spock was later hit by a lightning bolt while he and Kirk approached Vaal. The bolt, which hit Spock in the back, knocked him to the ground, and resulted in a second-degree burns. (TOS: "The Apple")
In 2267, a lightning storm was witnessed during a visit of the USS Enterprise to the Halkan homeworld. The lightning storm was caused by an approaching ion storm, which led to a transporter malfunction, and switching several Enterprise crewman with their mirror universe counterparts. (TOS: "Mirror, Mirror")
The Greek gods had the ability to control lightning. In 2267, this power was demonstrated by Apollo, after he was discovered on the planet Pollux IV by the USS Enterprise. (TOS: "Who Mourns for Adonais?")
In 2287, a being claiming to be God on the planet deemed to be Sha Ka Ree in the galactic core used lightning in an attempt strike James Kirk and his compatriots after they refused to yield their starship, the Enterprise-A. (Star Trek V: The Final Frontier)
In the early 24th century, a six year old Katherine Janeway witnessed a bolt of lightning split an oak tree in her grandfather's yard; one she had climbed in just a few hours before. She would later state that no encounter with an anomaly could elicit more fear in her than that storm. (VOY: "Shattered")
In 2364, the USS Enterprise-D (and several Ferengi encountered a lightning storm on a planet in the Delphi Ardu system. (TNG: "The Last Outpost")
The USS Enterprise-D encountered lightning-like bolts in a nebula while hiding from a Borg cube. (TNG: "The Best of Both Worlds")
Geordi La Forge and a Romulan soldier encountered what could be described as lightning on an alien planet. (TNG: "The Enemy")
During the appearance of the Dal'Rok in the Sirah's village on Bajor, lightning would be emitted from it, some striking the ground. (DS9: "The Storyteller")
In 2370, Quark visited Vaatrik Pallra on Bajor during a storm with lightning. (DS9: "Necessary Evil")
Later that year, the crew of the USS Enterprise-D simulated a lightning storm on the holodeck while covertly transporting a group of Boraalans to a new planet after their homeworld, Boraal II, became uninhabitable. (TNG: "Homeward")
In 2373, after Risas weather modification network was shut down, several lightning storms occurred with thunder and rain. (DS9: "Let He Who Is Without Sin...")