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Joslyn "Joss" Jackam, nicknamed Weather Witch by Caitlin Snow, is the estranged daughter of Mark Mardon and an unnamed woman, and the niece of the late Clyde Mardon. She is a recurring enemy of the Flash, using the elemental powers of her Weather staff to emulate her father's abilities.


Original multiverse

Early life

Joslyn Jackam was born to Mark Mardon and an unnamed woman when they were still in high school. Mark left Joslyn and her mother while they were both in the maternity ward to focus on his criminal career. As a result, Joslyn grew up hating her father for his abandonment.[1][2] Joss implied that her mother had emotionally abused her, which resulted in her running away from home at the age of 13. Joss stayed with a group of other teenage runaways under an overpass until she was caught and put back into her custody.[3]

Joss later became a self-taught amateur meteorologist, but lost her grant after too many dangerous experiments. She was also a storm chaser and developed a blog to document what she saw. [1]

Revenge on her father

Joss as Weather Witch.

On the night of the Enlightenment, Joss' weather van was struck by the S.T.A.R. Labs satellite. A component of the van was transformed into a meta-tech staff with the ability to control the weather, similar to her father and uncle's powers. She would later attack a power plant in her plan to kill her dad and broke into Iron Heights to kill him, but the Flash intervened and took Mardon away and she demanded him to be brought to her. She was tricked by Team Flash after dropping a truck on a hologram of Iris West, who was impersonating her dad. She planned to destroy the whole of Central City but was stopped by the Flash and incarcerated in Iron Heights, with her staff being stored away within the S.T.A.R. Labs particle accelerator by Team Flash.[1]

The Flash fights Weather Witch.

Trial and young Rogue membership offer

Joss finally got her day in court, however, she was riddled with guilt of her actions, even proclaiming so after Nora's testimony of CSI evidence became heated of the potential damage Joss could done at the airstrip she attacked. However, the transport van was stopped by a woman named Raya Van Zandt who wanted to use Joss's services as The Weather Witch for a newer younger Rogue group she was pulling together. However, Joss wanted to serve her sentence and not be molded in a career criminal like her father. She summon a fake hurricane to get the Flash attention but she got XS instead who was distrustful of her despite genuine sincerity of cooperating with Team Flash and CCPD about her taker.[2]

Raya and Joslyn steal a car from A.R.G.U.S.

However, Nora turns her over in the police station, not giving Joss a second chance or backing up her claims of having nothing to do with the escape from the van. Joss is in her holding cell and hears the commotion Raya is causing for a distract to let Joss escape. Given back her staff and believing she has no other option, she this time agreed to help Raya. They broke into A.R.G.U.S and stole a stealth car that Raya called the S.A.M. Joss turns around when XS hacks the car communication system and gives her a heartfelt apology and urges Joss to give her a second chance at well.[2]

Moved by this, Joss makes the road icy leading the car veering off to the side before it hits XS. Killer Frost and XS learn of this after the latter initially thought it was the former leading them to change their mind about Joss after thinking of her as only a criminal.[2]

A couple months later though, it seemed as is Joss had fully turned her back on redemption, scoffing at Nora's no killing rule and eventually betraying her. She also left Raya in Bolivia and alluded to killing her, however it's not certain that the latter was true.[1]

Young Rogues.

Joslyn arrived with Brie Larvan and Peter Merkel, each assuming one of the team hired them for the job. Nora West-Allen/XS revealed she hired the Young Rogues, much to everyone's surprise. Nora explained she needed them to steal a weapon called the mirror gun from McCulloch Tech to sell it for $1 million on the black market. As the group worked, they discussed being betrayed by people they once trusted. The Young Rogues first broke into S.T.A.R. Labs to steal Spencer Young's phone and kidnap Cisco Ramon, also kidnapping Sherloque Wells in the process. Nora forced Cisco to alter Spencer's phone in order to hack into McCulloch Tech's and control Larvan's bees. Joss seemed to empathize with Nora's story of how Barry left her and told her own story about paternal abandonment, advising Nora to give up on the idea of family. The Young Rogues infiltrated McCulloch Tech and after neutralizing the security guards, they decided to betray Nora. The Young Rogues tied Nora to a chair with the guards and filmed a video to the city, demanding the Flash to reveal his identity. However, the "guards" were actually Team Flash in disguise. Once the team destroyed the power dampener, giving XS and Flash their abilities, Joslyn run off to prison, arrested with the rest of the Young Rogues.[3]

Anti-Monitor Crisis

During the Anti-Monitor Crisis, Joslyn as well as everyone in the multiverse except for the seven Paragons, was killed in an antimatter wave by the Anti-Monitor on December 10, 2019,[4] only to be restored a month later, after the Paragons and the Spectre created a new universe.[5]

New multiverse

At some point in the history of Earth-Prime, Weather Witch fought Supergirl.[6]

Attack on downtown National City

Joslyn stirs up trouble in National City.

In January 2020, Weather Witch attacked downtown National City, but was confronted by Supergirl. As she was about to attack Supergirl with lightning, the Flash appeared and knocked her out, apologizing to Supergirl for the incident as she was "one of [his]". Weather Witch's presence in National City, combined with The Flash's appearance, caused Supergirl to realize she was not on a restored Earth-38, but an entirely new Earth containing elements from old Earths.[6]


Joss largely seems to blame her father for her life going wrong, when in fact he barely was in it. Her mother was said to largely abuse her emotionally, comparing her with her father, which may have caused her vitriol. She has quite the short temper, and will fight people, regardless of whether the opponent is stronger or more powerful than herself. Joss, regardless, is a highly intelligent individual, as she is a self taught expert in meteorology at a young age, and has come up with plans for being a criminal which were executed near flawlessly, such as when she dropped a truck on her father's head and ensured the Flash and XS couldn't come after her.

Powers and abilities


  • Abilities via weather staff: All of Joss' powers come from her staff; which allow her to harness the power of atmokinesis.[1]
    • Atmokinesis: The staff is able to control the weather in various ways; such as summoning lightning and conjuring storms.[1]


  • Skilled markswoman: Joss showcased great accuracy when using a tranquilizer gun, able to shoot three guards before they could react.[3]
  • High Level Intellect: Joss was described by Caitlin as a "self-taught expert in theoretical meteorology".


Original multiverse

Weather staff.

New multiverse


The Flash

Season 5

Season 6

Season 7

DC's Legends of Tomorrow

Season 5


Behind the scenes

  • Joss is an amalgamation of two characters from the comics: Josh Jackam and Weather Witch.
    • Joss's comics counterpart, Joshua "Josh" Jackam, was the son of Mark Mardon and Julie Jackam. He was at first believed to be Wally West’s son since Julie had also been with him until it was revealed he had the same powers as Mardon. Josh was ultimately murdered in front of his father by Kid Zoom during Final Crisis.
    • In the comics, Weather Witch was an ex-prostitute who worked for Penguin and joined a group called the New Rogues, replacements who used the original Rogues' gimmicks as seen in Gotham Underground. They were sent by Libra during Final Crisis to coerce the Rogues back into the Secret Society, but the Rogues refused and slaughtered the New Rogues.
  • Rorelee Tio was a stunt double for Reina Hardesty in the role of Joslyn Jackam.