Due to panic reaction of citizens, level of emergencies such
as current threat levels of terrorist, or levels of fast pace
flooding, must be sent along with the warning message. So that
the citizens would make the right decision that is not too panic
or too clam. The confidence of crisis occurrence should also be
added. Some crisis depends on the prediction such as snow
storm, flooding, or tsunami. Especially for last case, the quick
and widespread announcement is the most important.