This loop of GOES-8 imager 10.7 micrometer InfraRed (IR) shows the development of convection along and east of a surface dry line that was moving eastward across Texas on 28 March 2000. The GOES-8 satellite was placed in Rapid Scan Operations (RSO) mode, allowing imagery at 5-10 minute intervals during much of the period. Note the "enhanced-v" cloud top signature just south of the Texas/Oklahoma border on the 23:25 UTC image -- the first tornado was reported from this storm around 23:24 UTC. A more subtle enhanced-v signaure was evident on the 23:45 UTC image, about a half hour prior to the Ft. Worth tornado (which began around 00:22 UTC). Ft. Worth is located at the center of the images (station identifier KFTW).