The NWS has specific criteria for sounding an alarm. You probably haven't experienced weather severe enough for the National Weather Service to sound the alarm. http://www.nws.noaa.gov/nwr/nwrwarn.htm gives you an in-depth explanation of the procedures that occur when an alarm is sounded. It also gives you the certain events that must take place in order for them to sound an alarm.
The unit has 2 alarms (alarm 1 and 2). They can be used
together or independently. Alarms 1 and 2 have different
sounds so that you can differentiate them. The alarm will
sound for 1 minute unless it is disabled.
To set the alarm:
Navigate to "Set Alarm" setting mode as shown in the
Changing Settings section. The order of the settings is;
alarm 1 or 2, hour and minute.
To enable or disable the alarm:
• Press MENU until you reach alarm 1 or 2 display.
• Press [UP] or [DOWN] button to enable or disable the
alarm. "-:--" means disabled.
OK.
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