 Also, sirens may be activated to warn the public who are not listening to media to take cover.The following example of a significant weather advisory was issued by the Norman, Oklahoma National Weather Service on July 14, 2011.SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1251 AM CDT THU JUL 14 2011

OKZ015-140600-
DEWEY OK-
1251 AM CDT THU JUL 14 2011

...SIGNIFICANT WEATHER ADVISORY...