A severe weather warning means that severe weather is indicated by radar or is actually occurring. You may hear the warning broadcast on NOAA Weather Radio or you may hear a siren sound. When a tornado warning is issued, Sarpy County sounds its sirens once as an initial warning. National Weather in Valley will issue statements and updates during the warning if they can. Sarpy County does not issue an all clear signal.
Every tornado warning is issued with an expiration time.
National Weather will cancel a tornado warning, allow it to expire, or extend it as needed. Tune to NOAA Weather radio, or TV or radio broadcasts for updates on tornado warning. Sarpy County EMA tests all outdoor warning sirens at 10 AM on the first Saturday of the month from April to November. The sirens are not tested in the winter because their mechanisms are usually frozen, and severe weather is rare during those months. National Weather at Valley issues a severe weather outlook three times a day between April 1 and September 30 whether severe weather is expected or not.