STX weather is always an oddity to observe, especially the RGV. A couple of areas of the RGV, namely Weslaco and north east of Weslaco, got a consistent 6" or so of rain, some areas brushing 8".
Other parts, didn't break 2". Now, to see the goat rope that 6" to 8" of rain causes in the mid-valley should be a sphincter tightening spectacle for all that live in the RGV. As I have mentioned on here before, I was able to see arial pictures of the flooding in the RGV after Buelah, like a few hours after. The guy I bought my property in PI had them as he was a big aviation geek and knew the pilot that flew the flight.
https://myrgv.com/uncategorized/2017/09/19/remembering-beulah/There were huge swaths of the RGV, up through Mission/La Joya area that were under water, and water was running all kinds of directions as it found the path to the Arroyo and river. A forgotten fact is that across from Starr county, in the far western part of the Valley, the Mexican side is the lower river side (hence the really good farm land in that area) and it was basically totally decimated by flood waters, thousands fled across the bridge to RGC. Most of Camargo, and to the east and west of it, was underwater for months, that municipality actually never recovered from the flooding and lost about 30% of it pre-storm population.
Back when Beulah hit the population of the RGV, to include the Mexican side, was around 650-700K. Currently, including the Mexican side, there are at least 3.5mm folks, likely more, on both sides of the River. If another Beulah hits the STX/NMX it is gonna be a disaster of epic proportions.