Tornado Warning 2 : A tornado has been sighted or indicated by weather radar. If a tornado warning is issued for your area and the sky becomes threatening, move to your pre-designated place of safety
City of Chicago, Emergency Management & Communications (Alert Chicago - Emergency Preparedness), Glossary of Emergency Preparedness Terms, City Hall Chicago, Illinois, USA 2015. http://www.cityofchicago.org/city/en/depts/oem/sup p_info/alertrespond/glossary.html, (Emr Prep - Amer) {870}