Outdoor Warning Sirens

The Frisco Fire Department sounds its Outdoor Warning Siren System every Wednesday at noon. These weekly, audible tests are meant to ensure the sirens were working properly and to help prepare for any severe weather that threatens Frisco.

See Also:

Se├▒ales de Advertencia al aire libre (PDF)


When testing the sirens each week, the Fire Department will sound the sirens on days when skies are overcast and gray but not threatening. However, when severe weather is in the forecast, sirens will not be sounded unless there is an actual emergency.
Outdoor Warning Siren

Warning Sirens

The City of Frisco's Outdoor Warning Siren system consists of 35 sirens placed strategically throughout the city. The sirens may be activated individually or in groups to provide localized warnings. Sirens may also be activated simultaneously to provide a general alert for the entire community. The Outdoor Warning Sirens can be controlled from either the Central Fire Station, the 911 Dispatch Center at the Frisco Police Department or from certain Fire Department vehicles.
Outdoor Warning Sirens
The Outdoor Warning Siren system uses certain tones to alert residents to the imminent approach of severe weather (including a tornado warning, destructive winds in excess of 70 mph, and reported hail of 1.25" in diameter or greater) and other emergencies requiring immediate notification. Radio and television (including the city's government access channels) as well as public address systems mounted on fire and police vehicles, may also be used to provide information to our citizens, as needed.

The 2 types of warning signals used are:

  • Wail Signal: This is used for severe weather (including an actual tornado warning) as well as our Wednesday siren testing.
  • Alert Signal: This is used for other alerts the city of Frisco requests its citizens to be aware of, like a hazardous material incident.


If you should hear the warning sirens, go inside and seek shelter immediately. Turn on a radio or television and listen carefully to instructions. WBAP Radio 820 AM is the designated Emergency Alert System (EAS) station for our area. Frisco residents with cable should tune to:
  • Channel 12 for Grande subscribers
  • Channel 16 for Time-Warner subscribers
  • Channel 37 for Verizon FIOS subscribers
  • Channel 99 for AT&T U-verse subscribers
Stay indoors until the danger passes. Please do not call 911 or Frisco Fire Stations for information unless you are reporting a life-threatening situation or hazardous condition.