Wyoming communities to sound tornado warning sirens as part of Wednesday drills By Brendan LaChance on May 10, 2021 (Shutterstock) CASPER, Wyo. — Wyoming communities may be sounding their local warning sirens as part of tornado drills scheduled for Wednesday, May 12. Some schools around the state will also be conducting safety drills for students on Wednesday, according to the National Weather Service in Riverton. The NWS in Riverton will also be conducting a special test of the National Oceanic and Atmospheric Administration Weather Radio weekly broadcast which will serve as a tornado drill. That will occur at around 9 am Wednesday. “The drill is designed to allow emergency services organizations, schools and the public to test their severe weather plan and better educate the public involving how to respond to a tornado warning,” the NWS in Riverton says. “You should use this special NOAA Weather Radio test as your tornado drill and it is encouraged that you treat this like a real event so that you can test your safety plan.”