Wis. Stat. § 968.09: Warrant on failure to appear.

(1) When a defendant or a witness fails to appear before the court as required, or violates a term of the defendant’s or witness’s bond or the defendant’s or witness’s probation, if any, the court may issue a bench warrant for the defendant’s or witness’s arrest which shall direct that the defendant or witness be brought before the court without unreasonable delay. The court shall state on the record at the time of issuance of the bench warrant the reason therefor.

(2) Prior to the defendant’s appearance in court after the defendant’s arrest under sub. (1), ch. 969 shall not apply.