The Weather Services uses a two-step alert to warn people of tornado danger: The WATCH tells you that atmospheric conditions are ripe for tornadoes, although none have been sighted; the WARNING tells you a tornado has actually been spotted, visually or on radar. 

When staff is made aware of a tornado warning condition that includes the IWU campus, staff will direct residents to evacuate to designated tornado shelter areas in each residence hall.  Residents are strongly encouraged to evacuate immediately at the onset of the warning, and before the sounding of local sirens indicating an imminent or immediate risk that may not give students time to move to safety.  Residents will be released from shelter areas when the "all clear" is given by civil defense authorities.