Overview
- The system was designated a Potential Tropical Cyclone (Uno) over the southern Texas–Tamaulipas coast on Tuesday and the NHC says it has a high chance of becoming Tropical Storm Arthur within 48 to 72 hours.
- Tropical‑storm watches and warnings extend from Sargent, Texas, to Morgan City, Louisiana, and the NHC has placed short‑term development odds at roughly 60–70 percent.
- Officials emphasize the main hazard is rainfall, with forecasts of 100–200 millimeters of additional rain across large areas and isolated totals up to about 300 millimeters that can trigger flash floods and river rises.
- The system has already produced dangerous flooding that forced multiple water rescues, road closures and at least one confirmed death in Texas, and state and federal emergency resources have been activated.
- Mexican agencies have issued alerts for Tamaulipas, Nuevo León and several other states with expected 75–150 mm in the hardest‑hit areas, and authorities on both sides of the border urge people to avoid flooded roads and follow official updates.