SPC SWODY2 seems to follow 12Z CAM guidance closely, with an area of very favorable EHI just S of I-10, such that Houston is barely marginal but nearby SGR, 15 minutes away (an hour away rush hour) is in a 5% tornado risk. 18Z doesn't look much different. Immediate HOU looks slightly elevated.
Houston, as a trend, underperforms, coastal storms retard inland progression more than models forecast. So the odds 0Z models will shift much on something less than a day away.
But Houston rarely has interesting severe weather (last F-4 (pre-EF scale) was November 1992, IIRC) and slight weenie even for slightly elevated storms. Severe isn't my big thing, snow/ice and tropical, but DFW, a typical thunderstorm matches a once a 5 year Long Island storm.