You know about a lot of stuff!
Your right, the trinity basin swings NW and W to Dallas...most of the heavy rain is tending NE.
I lived in Dallas from 79 to 81.
Right behind the Chi-O house at SMU.
They sing naughty songs on Tuesday nights.
They just announced on KHOU that a 80,000 cfm release has started from the dam on Lake Livingston. This was necessitated by damage to the dam that needs to be assessed.
They are trying to prevent a breach or catastrophic failure of the dam. Downstream flooding will occurr and evacs have been ordered:
http://www.khou.com/perl/common/video/yahooPlayer.pl