We may already have a hint at something. It's also possible I'm just reading too much into this satellite, time will tell. Just SSE of Brownsville, TX, approx. 26 N, 97.5 W, there is a burst of convection accompanied by some sort of hint of circulation. I can't tell if it is Upper or Lower level yet, or if it will end up being anything more than just convection.
Water Vapor Sat
Very evident on WV loop.
Also another good look is the Brownsville Radar.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BROWNSVILLE TX
124 PM CDT THU SEP 10 2009
UPPER LOW CURRENTLY IN THE VICINITY OF DEL RIO WHILE AT THE SFC
LOW PRESSURE SEEMS TO BE STARTING TO WRAP UP NEAR LRD. SFC WINDS
REMAIN LIGHT ONSHORE AT THE SFC ALONG THE COAST WITH WESTERLY FLOW