Forecasters Warn Likely Flash Flooding for Texas Hill Country and Lower Rio Grande Valley

Overview

• The Weather Prediction Center said late Wednesday that expanding storms south of San Angelo may organize into complexes that produce roughly 2 inches per hour over parts of the Hill Country.
• A slow‑moving convective cluster in the Lower Rio Grande Valley is producing 2+ inch‑per‑hour rates in a very moist, highly unstable pocket with about 2 inches of precipitable water.
• Forecasters warned the main convective line expected to move out of Mexico overnight could merge with these clusters and add 2–3 inches, creating broader 2–4 inch swaths and isolated 5+ inch totals where storms overlap.
• Hydrologic risk differs by area because parts of the Hill Country have saturated soils that favor rapid runoff while the drought‑stressed RGV has higher flash‑flood guidance but remains vulnerable in urban spots to intense rates.
• Local NWS offices and river forecast centers have been alerted and residents in Llano, the Round Rock/Austin metro and urban RGV should monitor watches, warnings, and rapidly changing radar for flash‑flood threats.