The Alarm For the past decade, natural disaster by extreme volatile weather has occurred repeatedly around the world. We hear over and over almost every year that the scale of extreme weather like heavy rains or consecutive days without any rainfall is the largest ever since starting recording. once a local government didn't express the alarm of disaster and faced a barrage of criticism for some casualties, municipalities came to give an alarm shortly just in case whenever it's possible. In recent days, my city gave a warning of heavy rains in the evening four days in a low. Although it may have been worked because one of that caused minor damages by a landslide, a repeated warning would get people to numb with the alarm and lose their attention. We do not forget that this daily warming led people to hesitate early evacuation at the Tohoku earthquake and tsunami in 2011.