You're right. The recent turn in events with El Nino strengthening causes warmer ocean surface waters in the Equatorial East Pacific which is altering the weather pattern and creates more rain in Texas. The La Nina pattern which existed the last several years created the historical drought conditions. Now, we have an Atmospheric River that is being propelled by a southward dip in the jet stream that combines with humid gulf moisture and fires it like a slingshot across Texas. Also, when the afternoon temperatures heat up it intensifies the convective activity. The long, narrow front we had yesterday was shaped like a bow and was fast moving until the bottom of the bow flattened out, stalled across Houston, and rained all night.
