It's no surprise that summer's heat and humidity are in full effect in southeast Texas. It is July, after all. What is surprising is the continued flooding as storms form from the Red River eastward into the Ohio River Valley. A high pressure ridge depicted above is allowing temperatures to soar into the mid to upper 90s from east Texas into the Southeast.
A stalled front stretching from the mid-Atlantic back to the Red River is the cause of recent rains there. Eventually, the high will slide back toward Central Texas, giving some drying relief to northern neighbors. This is what the upper-level pattern looks like by Saturday:
Until then, the best chance for any rain in Southeast Texas remains isolated showers developing along the coast from the sea breeze. Depending on how far west the ridge shifts, there could be more widespread showers toward the end of the weekend. Here's what the short-range model depicts for rainfall (green) by Saturday: