December 17th going into the 18th, 2012 … from KBRO Brownsville Texas NEXRAD RADAR — we see multiple plumes, showing as heavily reflective [red/orange/yellow on RADAR] coming from around Hidalgo County Texas.
Backdated NEXRAD RADAR feed linked below : remember to use the GMT / UTZ / Z times: This event is timestamped below in the screenshots, occurring at approximately 20:00UTC/GMT/Z
Why the sudden county wide venting? That is a very good question to be asking right now.
click below pictures to enlarge: