SnowStorm

Snowstorm is the het ship between Caitlin Snow and Ronnie Raymond from The Flash fandom.

Canon
Caitlin and Ronnie met as both employees of S.T.A.R. Labs. At one point the two fell in love and started dating; due to the stress of dating and working together they went to couples therapy.

The two were a couple for at least a year and at one point Ronnie asked her to marry him in front of a waterfall and she accepted.

Season 1
At one point they started working on a particle accelerator, but unfortunately the evening of ignition it malfunctioned and Ronnie and Cisco Ramon had to try to intervene to prevent or at least an explosion; Caitlin didn't want to, but Ronnie knew it was his duty to go.

Eventually, Caitlin descended into the booster, but Ronnie was in a room locked from the inside and he and Caitlin had one last conversation over walkie-talkies, until the booster exploded seemingly killing young Raymond, with immense Caitlin's pain.

The shock will also prevent her from going near the accelerator for months, but despite the incident she remains working at S.T.A.R. labs and discovers that many people have gained superpowers due to the explosion of the accelerator and one of them Barry Allen chooses to use his abilities to fight crime and stop others who abuse their powers.

Fanon
This ship doesn't have many fans and despite being canon it is less popular than the Snowbarry which is fanon, as Ronnie was in the series for a short time and he and Caitlin didn't have many moments together. However, there are videos and fanfictions dedicated to this ship, even if it is also possible to find it in the Snowbarry fanfictions that rework Caitlin's mourning as a method to bring her closer to Barry.

Fandom

 * Fan Fiction
 * Caitlin/Ronnie on Fanfiction.net