It was different for every country but it usually sound alert , radio broadcast alert or breaking news on TV. But in common sound alert will be use during a Tsunami.
A severe weather warning is issued when dangerous weather conditions, such as strong winds, hail, tornadoes, or flooding, have been spotted in a given area. This warning is meant to alert people to take immediate precautions to protect themselves and their property.
If the Gov't have access to Tsunami warning buoys, seismographs etc, they can spot the initial disturbance in time to get people away from coastal areas. Radio broadcasts, tv, can be used to tell people to evacuate.
Tsunami is the name given to a tidal wave.
A storm watch indicates that a storm of a given type may be possible in your area. They basically inform people to be on alert for dangerous weather conditions.
aid have always bin in Africa, but more were given out when the tsunami happened, now everyone is dieing in Africa of aid and HIV.
Tsunami
There was not "Catrina tsunami" as tsunamis are not given names. You are most likely referring to Hurricane Katrina, which killed 1836 people in the U.S. in 2005.
Heavy damage to a nuclear power plant by a tsunami.
not likely...............
Only very occasionally.
The motion picture The Impossible was based on the real-life survival story of the Belin Family who was on Christmas vacation in 2004 when a tsunami devastated the island of Indonesia. Resulting from an earthquake in the Indian Ocean, the tsunami has been given a variety of names including the South Asian tsunami, the Indonesian tsunami, the Christmas tsunami, the 2004 Indian Ocean tsunami and the Boxing Day tsunami. The latter name originates from a holiday that is celebrated in certain countries throughout the world on December 26, the actual day the Indonesian tsunami occurred.
The correct name for the average weather given at a certain time of year is "climate".