National Weather Service (NWS) released Civil Emergency Messages (CEM)
A Civil Emergency Message (SAME CODE: CEM), which is transmitted by the National Weather Service at the request of local authorities, is a warning created by the NWS that’s meant to warn of an in-progress or imminent significant threat(s) to public safety and/or property. Examples of such threats include, but are not limited to, a hazardous materials release or a dam failure. Issuance of a CEM may generate the activation of the All-Hazards Outdoor Warning Siren System. Action steps for those hearing an outdoor warning siren are to seek sturdy shelter and additional information on the nature of the threat, including timing, location, and severity.