The Burr Oak, Michigan tornado I found was rated F3 on the Fujita scale, which is the same as an EF3-equivalent strength in plain language. That storm event is listed by NOAA for Van Buren County, Michigan, on April 3, 1956, with magnitude 0 and scale F3.

What that means

An F3 tornado is considered a strong tornado , capable of causing severe damage. The NOAA storm record tied to Michigan shows this specific event in Van Buren County, not Burr Oak itself, so if you meant a different Burr Oak- area tornado, the rating could be different.

Extra context

  • Location: Van Buren County, Michigan.
  • Date: April 3, 1956.
  • Listed intensity: F3.

TL;DR

If you mean the Burr Oak, Michigan tornado in the historical NOAA record, it was an F3 tornado.