Attention, CNN: There will be extra tornado sirens in Minnesota next week The national broadcaster was caught by surprise by the test this past Wednesday. Author: Hennepin County Emergency Management CNN better inform its reporters now, because Minnesota can expect another round of tornado siren tests next week. The national broadcaster was caught by surprise when one of its reporters was on air outside the Derek Chauvin trial in Minneapolis when the tornado tests happened this past Wednesday – as customary on the first Wednesday of the month. And Minnesotans have been warned they can expect another round of sirens next Thursday, Apr. 15, as Minnesota marks "Severe Weather Awareness Week" from Apr. 12-15.