WOWT will announce Pat Persaud's exit tonight during its 10 p.m. newscast. According to sources, Tracy Madden will move up when Persaud leaves the station on May 25th.In a memo sent to WOWT staff this afternoon, News Director John Clark says that it is "with mixed emotions" that he announces Persaud's "retirement." The memo goes on to say that Persaud is leaving to devote her full-time energies