11.   The Federal Communications Commission this year replaced the system with an emergency alert system, a digital system that can target the warnings to the affected area.

12.   The government has decided to help us out a little by coming up with a color-coded alert system based on the seriousness and likely potential of the threat.

13.   The governor is also waiting federal go-ahead on plans to use CHP officers as sky marshals and a tiered security alert system.

14.   The low-level wind-shear alert system warns controllers, who can tell pilots, when contradictory readings on the ground indicate that a wind shear may be present.

15.   The Little Rock airport is equipped with a low-level wind shear alert system that uses sensors to detect wind gusts and wind shear, FAA spokeswoman Alison Duquett said.

16.   Vinson is going to Washington, D.C., on Friday to hopefully finalize the alert system, he said.

17.   A collision alert system called TCAS, which warns pilots of nearby aircraft and tells them what evasive action to take, is required on commercial aircraft.

18.   Although it could help save thousands of lives, the alert system has been criticized among Mexicans because of a few false alarms since its inception.

19.   If an alert is issued by the Weather service, a user who has the alert system turned on hears an alarm.

20.   In both cases, on-board collision alert systems warned the pilots, who took emergency action.