April 21-25 is Severe Weather Awareness Week. According to the MN Department of Public Safety:
For more than 20 years, the state of Minnesota has conducted a Severe Weather Awareness Week in partnership with the National Weather Service and local governments. A statewide tornado drill is part of that event.
Most local and statewide radio, TV and cable stations will be participating in the drill. Television viewers and radio station listeners and TV viewers should hear or see a simulated tornado warning message at 1:45 p.m. This tornado drill warning should last about one minute. When the test is completed, stations should return to normal programming.
In addition, alerts for both the simulated tornado watches and warnings will be issued over the NOAA Weather Radios in the area which will activate the radio alerts. The afternoon drill will also occur at the same time in Wisconsin and is expected to be broadcast on most radio and TV stations.
For more information, click here.