This is from the 26th but it looked much better 4 days or so before.
I would call that a "textbook" Low.
What was so interesting, though, is that throughout those 4 days or so earlier in the week the isobars were never tight at all (weak gradient and relatively light winds) and generally didn't even form closed loops. During that time my pressure slowly varied from a low of 29.64 on Sept. 26 to highs of 30.00 inHg on the 24th and 25th. All very strange for such a well defined cyclone. The other oddity was the small, detached doughnut-shaped jet stream sitting roughly over Michigan.
In contrast, the current system that is presently over Michigan has tighter isobars (stronger gradient), lower pressures, and higher winds presently over eastern WI and Lake Michigan.