August 17, 2009 7:42 pm Dallas Revamps Sirens, Adds Reverse 911 The city is improving its weather warnings with reverse-911 calls and new sirens. Wake Up to Something Good 2:34 NBC 5 Forecast: Storm chances continue into Sunday 1:07 Hill County tornado caught on camera 2:49 NBC 5 Forecast: Storm chances continue this weekend 1:25 Several North Texas communities in storm's path battled flood 1:55 Storm in Hill County triggered Tornado Warning for hours