The setup: Surface winds are bringing in moisture from the Gulf. Meanwhile, an approaching area of low pressure from the west is pumping in upper-atmosphere moisture from the Pacific. That same wind flow brings occasional disturbances, which will initiate round of showers and thunderstorms in Texas.
The 7-day forecast shows fairly high rain chances Tue-Fri. This doesn’t mean it will be raining the whole time, but it will come in waves that could coat much of Southeast Texas with rain at times. A few storms could be potent with brief heavy rain.
On average, we’ll probably see rain totals between one and three inches this week. Some isolated areas could get more.