"is cataclysmic" is correct and usable in written English.
You can use it when referring to a destructive event or phenomenon that causes great and sudden change or damage. For example, "The impact of climate change on coral reefs is cataclysmic."
Dictionary
is cataclysmic
adjective
Of or pertaining to a cataclysm; causing great destruction or upheaval; catastrophic.
synonyms
Exact(9)
My bottom line is this: The status quo is cataclysmic.
The failure of Chris Robshaw's team is cataclysmic, individually and collectively.
To a statesman of this school, the biggest nightmare is cataclysmic change.
"And being at the museum is like looking at physical evidence of a crime that is cataclysmic in scale.
Holding the federal funding bill hostage "is bad enough, but the debt ceiling is cataclysmic," said Senator Charles E. Schumer, Democrat of New York.
For Ned, working against the probability of mass killing, Douglas's death is cataclysmic on its own scale: "His great friend was dead.
Similar(51)
The effect was cataclysmic.
"It was cataclysmic," Nichols says.
The results, he thought, could be "cataclysmic".
"These are cataclysmic events: millions died, a continent was dispossessed.
Her arguments with her mother could be cataclysmic.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com