For god's sake - don't you go to school...
"I did a 37" about 2 hours after I did that one..." would be just a bit better.
Why say it was 30"? You put a photo up so we could see how high you hopped. Quoting a measurement doesn't make it any better, and says nothing about the technicality of the move.
I know you'd like to share your feelings of success, but honestly, if everyone here posted pictures every time they hopped a bit higher then the forum would just be completely flooded. And yes, ditch the tape measures. We all ride, we can all tell (within an inch or two) how high something is by looking at it.
Jesus Christ...