Will a moving PI affect my admission chances?

[cubane]

I'm in a bit of an interesting situation...I am an undergrad who is currently finishing up applications for grad school for the fall 2018 cycle and my current PI is moving to one of  the schools I am applying to after the academic year. Is this going to be any bit helpful to my cause?

[St Andrews Lynx]

Maybe incrementally. 

It helps when your letter writers are known to the admissions committee - their word in your favour counts for a bit more. But your advisor may already been known and respected at the other schools you are applying to. I wouldn't expect anything more than that. 

Now, if you want to do your PhD with your undergrad PI then my advice would to be talk to them directly. PIs sometimes get to have a say on applicants who are interested in working for them - but not at every school.