Source:
http://www.weather.gov/os/NWS_EAS.shtml
EAS Event (NWR-SAME) Codes
Weather-Related Events NWR-SAME Code :Status
Blizzard Warning BZW Operational
Coastal Flood Watch CFA Operational
Coastal Flood Warning CFW Operational
Dust Storm Warning DSW Operational
Flash Flood Watch FFA Operational
Flash Flood Warning FFW Operational
Flash Flood Statement FFS Operational
Flood Watch FLA Operational
Flood Warning FLW Operational
Flood Statement FLS Operational
High Wind Watch HWA Operational
High Wind Warning HWW Operational
Hurricane Watch HUA Operational
Hurricane Warning HUW Operational
Hurricane Statement HLS Operational
Severe Thunderstorm Watch SVA Operational
Severe Thunderstorm Warning SVR Operational
Severe Weather Statement SVS Operational
Special Marine Warning SMW Operational
Special Weather Statement SPS Operational
Tornado Watch TOA Operational
Tornado Warning TOR Operational
Tropical Storm Watch TRA Operational
Tropical Storm Warning TRW Operational
Tsunami Watch TSA Operational
Tsunami Warning TSW Operational
Winter Storm Watch WSA Operational
Winter Storm Warning WSW Operational
Non-Weather-Related Events NWR-SAME Code :Status
National Codes-Required
Emergency Action Notification EAN Not currently implemented on NWR
Emergency Action Termination EAT Not currently implemented on NWR
National Information Center NIC Operational
State and Local Codes-Optional
Avalanche Watch AVA Operational
Avalanche Warning AVW Operational
Child Abduction Emergency CAE Operational
Civil Danger Warning CDW Operational
Civil Emergency Message CEM Operational
Earthquake Warning EQW Operational
Evacuation Immediate EVI Operational
Fire Warning FRW Operational
Hazardous Materials Warning HMW Operational
Law Enforcement Warning LEW Operational
Local Area Emergency LAE Operational
911 Telephone Outage Emergency TOE Operational
Nuclear Power Plant Warning NUW Operational
Radiological Hazard Warning RHW Operational
Shelter in Place Warning SPW Operational
Volcano Warning VOW Operational
Administrative Events NWR-SAME Code :Status
Administrative Message ADR Operational
National Periodic Test NPT Not currently implemented on NWR
Network Message Notification NMN Not currently implemented on NWR
Practice/Demo Warning DMO Operational
Required Monthly Test RMT Operational
Required Weekly Test RWT Operational
Naming Convention for EAS Event Codes
The FCC Report and Order which became effective May 16, 2002, established naming conventions for EAS event codes. In most cases, and for all future codes to be approved, the third letter of all hazardous state and local event codes is limited to one of four letters:
_. "W" for WARNINGS
_. "A" for WATCHES
_. "E" for EMERGENCIES
_. "S" for STATEMENTS
Note: The existing event codes for Tornado Warning (TOR), Severe Thunderstorm Warning (SVR) and Evacuation Immediate (EVI) will not be changed to conform to this naming convention.
_. A WARNING is an event that alone poses a significant threat to public safety and/or property, probability of occurrence and location is high, and the onset time is relatively short.
_. A WATCH meets the classification of a warning, but either the onset time, probability of occurrence, or location is uncertain.
_. An EMERGENCY is an event that, by itself, would not kill or injure or do property damage, but indirectly may cause other things to happen that result in a hazard. For example, a major power or telephone loss in a large city alone is not a direct hazard, but disruption to other critical services could create a variety of conditions that could directly threaten public safety.
A STATEMENT is a message contaning follow up information to a warning, watch, or emergency.