I've never seen this before. 3 Michigan high school girls went sub 17 today in the same early season invitational. In fact, only 1 girl in Michigan has gone sub 17 over the last dozen years or so - Meagan Goetheals at the 2009 Div. I state meet. Before you say the course was short, the results for the boys and the small school girls were about what you would expect and in line with prior years. The course is flat and fast and conditions were great. Footlocker should be interesting this year. Link to results.
https://www.athletic.net/CrossCountry/Results/Meet.aspx?Meet=129731