Despite the presence of strong low-level rotation that was detected on radar, the Tulsa County Emergency Management Agency did not activate civil defense sirens in Tulsa proper as the local National Weather Service forecast office did not issue a tornado warning until 1:25 a.m. CDT (06:25 UTC), two minutes before it spawned an EF1 tornado that spanned a 2 miles track across Broken Arrow, causing roof damage to numerous homes and bringing down several large tree limbs in the suburb.