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Emergency Alert System

The Emergency Alert System (EAS) is a national warning system in the United States designed to allow authorized officials to broadcast emergency alerts and warning messages to the public via cable, satellite and broadcast television and AM, FM and satellite radio. Informally, Emergency Alert System is sometimes conflated with its mobile phone counterpart Wireless Emergency Alerts (WEA), a different but related system. However, both the EAS and WEA, among other systems, are coordinated under the Integrated Public Alert and Warning System (IPAWS). The EAS, and more broadly IPAWS, allows federal, state, and local authorities to efficiently broadcast emergency alert and warning messages across multiple channels.[1] The EAS became operational on January 1, 1997, after being approved by the Federal Communications Commission (FCC) in November 1994,[2] replacing the Emergency Broadcast System (EBS), and largely supplanted Local Access Alert systems, though Local Access Alert systems are still used from time to time. Its main improvement over the EBS, and perhaps its most distinctive feature, is its application of a digitally encoded audio signal known as Specific Area Message Encoding (SAME), which is responsible for the characteristic "screeching" or "chirping" sounds at the start and end of each message. The first signal is the "header" which encodes, among other information, the alert type and locations, or the specific area that should receive the message. The last short burst marks the end-of-message. These signals are read by specialized encoder-decoder equipment. This design allows for automated station-to-station relay of alerts to only the area the alert was intended for.

Like the Emergency Broadcast System, the system is primarily designed to allow the President of the United States to address the country via all radio and television stations in the event of a national emergency. Despite this, neither the system nor its predecessors have been used in this manner. The ubiquity of news coverage in these situations, such as during the September 11 attacks, has been credited to making usage of the system unnecessary or redundant.[3] In practice, it is used at a regional scale to distribute information regarding imminent threats to public safety, such as severe weather situations (including flash floods and tornadoes), AMBER Alerts, and other civil emergencies.

It is jointly coordinated by the Federal Emergency Management Agency (FEMA), the Federal Communications Commission (FCC) and the National Oceanic and Atmospheric Administration (NOAA). The EAS regulations and standards are governed by the Public Safety and Homeland Security Bureau of the FCC. All broadcast television, broadcast and satellite radio stations, as well as multichannel video programming distributors (MVPDs), are required to participate in the system. Many countries have EAS as well.


Technical concept

Messages in the EAS are composed of four parts: a digitally encoded Specific Area Message Encoding (SAME) header, an attention signal, an audio announcement, and a digitally encoded end-of-message marker.

A Sage EAS ENDEC unit

The SAME header is the most critical part of the EAS design. It contains information about who originated the alert (the president, state or local authorities, the National Weather Service (NOAA/NWS), or the broadcaster), a short, general description of the event (tornado, flood, severe thunderstorm), the areas affected (up to 32 counties or states), the expected duration of the event (in minutes), the date and time it was issued (in UTC), and an identification of the originating station.

There are 77 radio stations designated as National Primary Stations in the Primary Entry Point (PEP) System to distribute presidential messages to other broadcast stations and cable systems.[4]

The National Emergency Message (formerly known as the Emergency Action Notification) is the notice to broadcasters that the president of the United States or their designee will deliver a message over the EAS via the PEP system.[5] The government has stated that the system would allow a president to speak during a national emergency within 10 minutes.[6][7]

Primary Entry Point stations

The National Public Warning System, also known as the Primary Entry Point (PEP) stations, is a network of 77 radio stations that are, in coordination with FEMA, used to originate emergency alert and warning information to the public before, during, and after incidents and disasters. PEP stations are equipped with additional and backup communications equipment and power generators designed to enable them to continue broadcasting information to the public during and after an event.[55][56][57]

Beginning with WJR-Detroit and WLW-Cincinnati in 2016, FEMA began the process of constructing transportable studio shelters at the transmitters of 33 PEP stations, which feature broadcasting equipment, emergency provisions, a rest area, and an air filtration system. NPWS project manager Manny Centeno explained that these shelters were designed to "[expand] the survivability of these stations to include an all hazards platform, which means chemical, biological, radiological air protection and protection from electromagnetic pulse."[55][56][57]

Communication links

The FEMA National Radio System (FNARS) "Provides Primary Entry Point service to the Emergency Alert System", and acts as an emergency presidential link into the EAS. The FNARS net control station is located at the Mount Weather Emergency Operations Center.[58]

Once an EAN is received by an EAS participant from a PEP station (or any other participant) the message then "daisy chains'" through the network of participants. "Daisy chains" form when one station receives a message from multiple other stations and the station then forwards that message to multiple other stations. This process creates many redundant paths through which the message may flow increasing the likelihood that the message will be received by all participants and adding to the survivability of the system. Each EAS participant is required to monitor at least two other participants.

EAS header

Because the header lacks error detection codes, it is repeated three times for redundancy. EAS decoders compare the received headers against one another, looking for an exact match between any two, eliminating most errors which can cause an activation to fail. The decoder then decides whether to ignore the message or to relay it on the air if the message applies to the local area served by the station (following parameters set by the broadcaster).

The SAME header bursts are followed by an EAS attention tone, which lasts between 8 and 25 seconds, depending on the originating station. The tone is 1,050 Hz on a NOAA Weather Radio station. On commercial broadcast stations, a "two-tone" attention signal of 853 Hz and 960 Hz sine waves is used instead, the same signal used by the older Emergency Broadcast System. These tones have become infamous, and can be considered both frightening and annoying by listeners; in fact, the two tones, which form approximately the interval of a just major second at an unusually high pitch, were chosen specifically for their ability to draw attention, due to their unpleasantness on the human ear. The SAME header is equally known for its shrillness, which many have found to be startling. The "two-tone" system is no longer required as of 1998, and is to be used only for audio alerts before EAS messages.[59][full citation needed] Like the EBS, the attention signal is followed by a voice message describing the details of the alert.

The message ends with 3 bursts of the AFSK "EOM", or End of Message, which is the text NNNN, preceded each time by the binary 10101011 calibration.

IPAWS

Under a 2006 executive order issued by George W. Bush, the U.S. government was instructed to create "an effective, reliable, integrated, flexible, and comprehensive" public warning system. This was accomplished via expansions to the aforementioned PEP network, and the development of the Integrated Public Alert and Warning System (IPAWS)—a national aggregator and distributor of alert information using the XML-based Common Alerting Protocol (CAP) and an internet network. IPAWS can be used to distribute alert information to EAS participants, supported mobile phones (Wireless Emergency Alerts), and other platforms.[60]

Under an FCC report and order issued in 2007, EAS participants would be required to migrate to digital equipment supporting CAP within 180 days of the specification's adoption by FEMA. This officially occurred September 30, 2010, but the deadline was later delayed to June 30, 2012 at the request of broadcasters.[61]

The FCC has established that IPAWS is not a full substitute for the existing SAME protocol, as it is vulnerable to situations that may make internet connectivity unavailable. Therefore, broadcasters must convert CAP messages to legacy SAME headers to enable backwards compatibility with the existing "daisy chain" method of EAS distribution, providing a backup distribution path.[61][62]

In December 2021, the FCC issued a notice of proposed rulemaking seeking to prioritize the display of alert audio and text from CAP messages, in order to provide higher quality audio (rather than simulcasting the audio off-air from a radio station) and improve parity between the visual display and alert audio for the benefit of the hard of hearing.[63] The rules were enacted in September 2022.[64]

Station requirements

The FCC requires all broadcast stations and multichannel video programming distributors (MVPD), hereafter "EAS participants", to install and maintain FCC-certified EAS decoders and encoders at their control points or headends. These decoders continuously monitor the signals from other nearby broadcast stations for EAS messages. For reliability, at least two source stations must be monitored, one of which must be a designated local primary. Participants are to retain the latest version of the EAS handbook.

EAS participants are required by federal law to relay National Emergency Messages (EAN, formerly Emergency Action Notification) immediately (47 CFR Part 11.54).[65] Broadcasters traditionally have been allowed to opt out of relaying other alerts such as severe weather, and child abduction emergencies (AMBER Alerts) if they so choose. In practice, television stations with local news departments will usually interrupt regularly-scheduled programming during newsworthy situations (such as severe weather) to provide extended coverage.[66]

If possible, EAS participants must transmit the audio,[64] and (where applicable) a visual display containing the extended text, from the associated CAP message.[61][62]

EAS participants are required to keep logs of all received messages. Logs may be kept by hand but are usually kept automatically by a small receipt printer in the encoder/decoder unit. Logs may also be kept electronically inside the unit as long as there is access to an external printer or method to transfer them to a computer.

System tests

All EAS equipment must be tested on a weekly basis. The required weekly test (RWT) consists, at a minimum, of the header and end-of-message tones. Though an RWT does not need an audio or graphic message announcing the test, many stations provide them as a courtesy to the public. In addition, television stations are not required to transmit a video message for weekly tests. RWTs are scheduled by the station on random days and times, (though quite often during late night or early afternoon hours), and are generally not relayed.[59][full citation needed]

A Required Monthly Test (RMT) transmitted in New Jersey on April 15, 2014, as shown on a television set

Required monthly tests (RMTs) are generally originated by the local or state primary station, a state emergency management agency, or by the National Weather Service and are then relayed by broadcast stations and cable channels. RMTs must be performed between 8:30 a.m. and local sunset during odd numbered months, and between local sunset and 8:30 a.m. during even numbered months. Received monthly tests must be retransmitted within 60 minutes of receipt.[59][67] Additionally, an RMT should not be scheduled or conducted during an event of great importance such as a pre-announced presidential speech, coverage of a national/local election, major local or national news coverage outside regularly scheduled newscast hours or a major national sporting event such as the Super Bowl or World Series, with other events such as the Indianapolis 500 and Olympic Games mentioned in individual EAS state plans.

An RWT is not required during a calendar week in which an RMT is scheduled. No testing has to be done during a calendar week in which all parts of the EAS (header burst, attention signal, audio message, and end of message burst) have been legitimately activated.

In July 2018, in response to the aftermath of the false missile alert in Hawaii earlier in the year (which was caused by operator error during an internal drill protocol), the FCC announced that it would take steps to promote public awareness and improve efficiency of the system, including requiring safeguards to prevent distribution of false alarms, the ability to authorize "live code" tests—which would simulate the process and response to an actual emergency, and authorizations to use the EAS tones in public service announcements that promote awareness of the system.[68][69]

Nationwide tests

On February 3, 2011, the FCC announced plans and procedures for national EAS tests, which involve all television and radio stations connected to the EAS, as well as all cable and satellite services in the United States. They are not relayed on the NOAA Weather Radio (NOAA/NWS) network as it is an initiation-only network and does not receive messages from the PEP network.[70][71] The national test would transmit and relay an Emergency Action Notification on November 9, 2011 at 2:00 p.m. EST.[72][73]

The Federal Communications Commission found that only half of the participants received the message via Integrated Public Alert and Warning System, and some "failed to receive or retransmit alerts due to erroneous equipment configuration, equipment readiness and upkeep issues, and confusion regarding EAS rules and technical requirements", and that participation among low-power broadcasters was low. To reduce viewer confusion, the FCC stated that future national tests would be delivered under the new event code "National Periodic Test" ("NPT"), and list "United States" as its location.[74][75]

A second national test, the first classified as an NPT, occurred on September 28, 2016 as part of National Preparedness Month.[76][77] A third national periodic test occurred on September 27, 2017.[78]

The fourth NPT occurred on October 3, 2018 (delayed from September 20, 2018, due to Hurricane Florence). It was preceded by the first mandatory wireless emergency alert test.[79][80][81]

The fifth NPT occurred on August 7, 2019, and moved up from past years to prevent it from occurring during the heart of the Atlantic hurricane season. The test focused exclusively on distribution to broadcast outlets and television providers via the primary entry point network to gauge the efficiency of alert distribution in the event the internet cannot be used.[82][83]

The sixth NPT was postponed to 2021 amid the ongoing COVID-19 pandemic "out of consideration for the unusual circumstances and working conditions for those in the broadcast and cable industry."[84]The sixth test occurred on August 11, 2021, at 2:20 pm EDT.[85] This test involved the WEA system alongside television and radio.

As of 2022, as part of a clarification and streamlining of terminology used in messages, further NPTs will now be referred to in the test message as a "Nationwide Test of the Emergency Alert System" issued by the United States Government.[86] On May 3, 2022, it was announced that the seventh NPT would not take place during 2022, and instead occur in early 2023.[87]

On August 3, 2023, FEMA and the FCC announced that the seventh NPT would occur October 4, 2023 with a backup date of October 11, 2023. The test commenced just before 2:20 pm ET, and consisted of an alert on TV/radio as well as a WEA on all cell phones.[88]

Additions and proposals

The number of event types in the national system has grown to eighty. At first, all but three of the events (civil emergency message, immediate evacuation, and emergency action notification [national emergency]) were weather-related (such as a tornado warning). Since then, several classes of non-weather emergencies have been added, including, in most states, the AMBER Alert System for child abduction emergencies. In 2016, three additional weather alert codes were authorized for use in relation to hurricane events, including Extreme Wind Warning (EWW), Storm Surge Warning (SSW) and Storm Surge Watch (SSA).

In 2004, the FCC issued a Notice of Proposed Rulemaking (NPR) seeking comment on whether EAS in its present form is the most effective mechanism for warning the American public of an emergency and, if not, on how EAS can be improved, such as mandatory text messages to cellphones, regardless of subscription. As noted above, rules implemented by the FCC on July 12, 2007 provisionally endorse incorporating CAP with the SAME protocol.

In November 2020, Congress passed the Reliable Emergency Alert Distribution Improvement (READI) Act.[89] First sponsored by Hawaii Senator Brian Schatz in response to the Hawaii false missile alert, it amends the Warning, Alert, and Response Network (WARN) Act to require distribution of wireless alerts issued by the administrator of FEMA, and commands the FCC to establish a means of reporting false alerts, encourage the establishment of State Emergency Communications Committees (SECC) that would meet annually to evaluate their EAS plans, require the repetition of alerts surrounding "emergencies of national significance", and open an inquiry into the feasibility of implementing the EAS on internet-related services.[90][91][92][93][94][95]

Limitations

The EAS can only be used to relay audio messages that preempt all programming; as the intent of an Emergency Action Notification is to serve as a "last-ditch effort to get a message out if the president cannot get to the media", it can easily be made redundant by the immediate and constant coverage that major weather events and other newsworthy situations—such as, most prominently, the September 11 attacks in 2001—receive from television broadcasters and news channels. Following the attacks, then-FCC chairman Michael K. Powell cited "the ubiquitous media environment" as justification for not using the EAS in their immediate aftermath. Glenn Collins of The New York Times acknowledged these limitations, noting that "no president has ever used the current [EAS] system or its technical predecessors in the last 50 years, despite the Soviet missile crisis, a presidential assassination, the Oklahoma City bombing, major earthquakes and three recent high-alert terrorist warnings", and that using it would have actually hindered the availability of live coverage from media outlets.[3][96]

Following the tornado outbreak of March 3, 2019, Birmingham, Alabama NWS meteorologist Kevin Laws told CNN that he, personally, wished that alerts could be updated in real-time in order to reflect the unpredictable nature of weather events, noting that the storm system's unexpected change in trajectory towards Lee County resulted in only a nine-minute warning (the resulting tornado would kill 23 people).[90]

The trend of cord cutting has led to concerns that viewers' lessened use of broadcast media in favor of streaming video services would inhibit their ability to receive emergency information (notwithstanding availability of alerts on mobile phones).[90][91] The READI Act called for an inquiry into the distribution of alerts via internet platforms.[90]

Incidents

False alarms

On January 13, 2018, a false alarm was issued warning of a missile threat to Hawaii.

Cybersecurity breaches

EAS equipment has been the subject of various cyberattacks, caused primarily by participants using insecure or factory default passwords on their encoders and decoders, and outdated software containing unpatched vulnerabilities. On multiple occasions, federal government departments have warned that failure to employ secure passwords and keep software updated made EAS equipment vulnerable to such attacks, which could result in disruptions such as false alerts.[114][115][116][117]

Tone usage outside of alerts

To protect the integrity of the system, and prevent false activations, the FCC prohibits the use of actual or simulated EAS/WEA tones and attention signals outside of genuine alerts, tests, or authorized public service announcements, especially when they are used "to capture audience attention during advertisements; dramatic, entertainment, and educational programs" (even if the footage is documentation of an event where an actual alert was issued).[128] Broadcasters who misuse the tones may be sanctioned (including being required to partake in compliance measures) and fined.[128] On YouTube, there is a small niche community of people who make Analog horror videos of fake EAS TV broadcast, often with fictional scenarios such as the zombie apocalypse, alien invasions, etc.

In an opposite move, in 2013 the FCC granted a one-year waiver for a PSA pertaining to the Wireless Emergency Alerts system, with assurance that the tones used in the PSA contained a different set of codes designed not to activate EAS receivers.[139]

Testing errors

See also

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