UNDATED (KDAL) - Both Minnesota and Wisconsin have designated April 21-25 as Severe Weather Awareness Week. It's a time for families and businesses to practice severe weather drills and to prepare for the potential of dangerous weather during the spring and summer months to come. Part of the week's activities will be a tornado drill on Thursday at 1:45 p-m and at 6:55 in the evening. The simulated warning will include a test of outdoor sirens and radio-tv notifications. According to the National Weather Service, Minnesota has an average of 40 tornadoes a year and Wisconsin averages 23 twisters annually. Other severe weather events to prepare for include lightning, floods, and extreme heat.