Time storm

A time storm or timestorm, also known as a chronometeorological event, (PROSE: Cat's Cradle: Time's Crucible) was a method of time/space transportation that could be experienced in many forms. Unlike traversing the time vortex in a TARDIS, time storms were usually directly experienced by the people being transported as a swirl of light and colours, (TV: Silver Nemesis) including scarlet, aqua, gold, white, heliotrope, lime, and vermilion, as it snapped out waves of random energy. (PROSE: Set Piece) They could be responsible for temporal refraction, which Narvin hypothesised might cause a localised time loop, as on Njagilheim. (AUDIO: Nevernor) They could happen if time was in a chaotic and unreliable state. (TV: Once, Upon Time)

Natural phenomenon
On Gallifrey, temporal storms regularly built up over the Myridian mountains. According to Romana II, this was not, to her knowledge, a natural occurrence on any planet other than Gallifrey. (AUDIO: Nevernor)

Time storms could be emitted by time rifts. (PROSE: Set Piece) The Third Doctor claimed to have seen time storms off Gallifrey (PROSE: The Loneliness of the Long-Distance Time Traveller) and the Tantalus Eye emitted temporal storms along with time winds. (PROSE: Engines of War) Ergostorms were a form of time storm that could occur in the ergosphere of a black hole in the hole was collapsing, causing space and time to warp. (AUDIO: Aquitaine)

In 2010 Elizabeth Meadows said that a temporal storm damaged a Cyberman ship and caused it to crash to the Arctic Circle ten thousand years prior. (GAME: Blood of the Cybermen)

Time storms were allegedly naturally occurring when time ran wild, which was the case during the Dark Times as well as in 2021, which was caused by Ravagers Swarm and Azure banishing the timekeepers, the Mouri, from the Temple of Atropos on the planet Time. (TV: Once, Upon Time)

Artificial storms
Halogi-Kari was a Harbinger with the natural ability to summon time storms. He used this as a service to kidnap people and displace them in time. He also allied with the Wraiths to allow them to time-storm their enemies. Although incarcerated by the Shadow Proclamation, he was later let go and began to time-storm humans from all over Earth to act as hosts for the Wraiths in the guise of a charity. The Thirteenth Doctor was able to resist his time-storms. (PROSE: At Childhood's End)

Fenric was one who had employed Halogi-Kari in his past, (PROSE: At Childhood's End) to take Ace through time in a time storm from her home town in Perivale, Earth to Iceworld, Svartos in order that she would meet the Seventh Doctor and then come to be of use in the final game against him. (TV: Dragonfire, The Curse of Fenric)

Fenric also took Lady Peinforte and her manservant Richard Maynarde from 1638 to 1988 in order to manipulate them into gathering the Nemesis statue. (TV: Silver Nemesis) Later, Fenric himself possessed a medallion in the form of a hammer that could conjure up time storms. (AUDIO: Gods and Monsters)

In his second encounter with Sutekh, the Seventh Doctor was pulled back in time (by Sutekh) through a time storm before Isis retrieved him, leaving Sutekh trapped in a ouroborous loop. (AUDIO: The Tears of Isis)

The Second Doctor caused a temporal storm when he tried to prevent a collision between his TARDIS and the First Doctor's and avert an alternate timeline. At the eye of the storm, he had some parting words with Katarina before they were transported back to their respective TARDISes. (AUDIO: Daughter of the Gods)

Other information
Sil referred to the time storm subsiding after Yrcanos was held in a time bubble until the right moment he could kill Kiv. (TV: Mindwarp, AUDIO: The Widow's Assassin)

The Eighth Doctor recalled a saying in the Academy about how the beat of a butterfly's wings in Mettula Orionsis caused a time storm in the Mutter's Spiral. (AUDIO: Storm Warning)

Daleks, Cybermen, Silurians and the Silents wanted to use the secrets of the time storms to rule the universe. (GAME: The Eternity Clock)

K9 Mark II corrected Ann Kelso when she called a chronal wavefront a "time storm," indicating they were not the same thing. (AUDIO: The False Guardian)

Doctor Who: Legacy
In the story of Doctor Who: Legacy, the Doctors and their companions encounter a time storm focusing on 25 December, leading them to face foes who struck at Christmastime.