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"Grey" is the British/Canadian spelling, the author appears to be American. The only times "grey" showed up in the article were in direct quotes, presumably from British English writers.

I'm an American and honestly I flip back and forth, which is probably frustrating to read.

Looks like 'Grey' was mostly used in quotes, whereas the author would use 'Gray'. I'd put it down to copy-pasting.

The spellings are both widely used apparently.

http://grammarist.com/spelling/gray-grey/

>Looks like 'Grey' was mostly used in quotes, whereas the author would use 'Gray'. I'd put it down to copy-pasting.

It's also common to respect the original spelling when quoting (e.g. consciously, not just as an artifact of copy/pasting)

And sometimes they use [sic] to indicate the unusual spelling isn't an error.

Do you know what the rules are for quoting speech? If a Brit says "gray sky", would you use the British spelling when quoting?

I'm not familiar with specific rules for quoting speech. I think different publishing houses and editors have their own conventions on this (which includes things like altering the spelling of the words to infer a specific accent).

She didn't. She quoted people using "grey," five times.