The new Wireless Emergency Alerts system gives the National Weather Service a new way to warn Americans about menacing weather, even if they are nowhere near a television, radio or storm sirens.
Beginning Thursday, the system will notify people about approaching tornadoes, hurricanes, blizzards and other threats. When a warning is issued for a specific county, a message of no more than 90 characters will cause late-model smartphones in that area to sound a special tone and vibrate.
Users do not have to sign up for the service or pay for the text message. And people who prefer not to get the warnings can opt out of the system.
"These alerts will make sure people are aware of any impending danger and provide them with the information needed so they can be safe until the threat is over," said Amy Storey, spokeswoman for CTIA-The Wireless Association, an industry trade group that helped set up the system.
The system does not yet work with all smartphones or in all areas. It is part of a broader alert network the Federal Emergency Management Agency launched in April that can also send public-safety warnings from the president and participating state and local governments. But the weather service estimates that more than 90 percent of the messages will be about storms.
The weather warnings will include tornadoes, hurricanes, typhoons, tsunamis, flash floods, extreme winds, blizzards and ice and dust storms. Designers were concerned about overloading users with too much information, so they deliberately limited the messages to warnings, not watches, and excluded severe thunderstorm warnings, weather service spokeswoman Susan Buchanan said.
