During these drills , the National Weather Service gives out test tornado warnings , and local Emergency Alert Systems and\/or NOAA Weather Radio ( normally as a weekly or monthly test ) are sounded , along with outdoor warning sirens . During these drills , the National Weather Service issues test tornado warnings , and local Emergency Alert Systems and\/or NOAA Weather Radio ( normally as a Required Weekly Test\/RWT , Administrative Message\/ADR , Practice-Demo\/DMO , or Required Monthly Test\/RMT ; Tornado Warning\/TOR can be used if a waiver from the FCC is granted since `` Live Code Testing '' is prohibited ) are activated along with outdoor warning sirens .