Actually, yes, it is.
https://en.wikipedia.org/wiki/Yiddish_orthography
[url=https://en.wikipedia.org/wiki/Yiddish_orthography][/url]
It can also be transliterated into the Roman alphabet. I remember a Seder I went to, where the Mom was reading the four questions from the Haggadah. She apologized because she'd learned it in Yiddish, not in Hebrew. And yet my four years of high school German helped, and followed her explicitly, whilst being completely dumbfounded as to how the words she spoke were coming out of that particular alphabet.