Farmers Branch, TX

Whelen Vortex R4 (Finback) - (32.9380442, -96.8326814). The sirens in Farmers Branch are known as “Vorbolts” because the sirens use Federal Signal UVs which have a tone that sounds like a Thunderbolt. Farmers Branch test there sirens on the 1st Wednesday of the month weather permitting. Submitted by TornadoSirensOfDFW.