Tropical System Development in the Gulf: KHOU 11 Weather Update

Tropical System Outlook

• 🎯 A tropical swirl has been identified in the Gulf with a 40% chance of development into a tropical system.
• 💡 The system is currently an exposed circulation with limited thunderstorm activity, but this may change as it moves over water.
• ⚠️ A flash flood watch is in effect for the Texas Hill Country, with scattered showers and thunderstorms.

Potential Impacts and Tracks

• 🌊 A flood watch has been posted for southeast Louisiana and southern Mississippi in anticipation of the system moving along the Gulf Coast.
• 🌧️ Even weak tropical systems are notorious for heavy rainfall, with expectations of flash flooding.
• 🗺️ "Spaghetti plots" show models clustering the system's track near the coast, potentially moving into the mouth of the Mississippi River or Lake Pontchartrain.
• ⚠️ Some models suggest a track further south, interacting with land, while others indicate a northern turn into Alabama and Georgia.

Factors Influencing Development

• 🌡️ Sea surface temperatures in the Gulf are very warm (86-90 degrees), providing ample energy for development.
• 💨 However, wind shear at mid and upper levels is currently hindering development by tilting the storm's circulation.
• 🏝️ The system is currently over land, cutting it off from its energy source, but will move over warm waters once it re-enters the Gulf.
• ⛰️ A large dome of high pressure is steering the system westward, and its eventual northward turn depends on where this ridge weakens.

Forecast Uncertainty and Next Steps

• 📈 Intensity forecasting is difficult due to the interplay of warm waters, wind shear, and proximity to land.
• 🔮 Models indicate a potential for the system to become a depression or named storm (Dexter) by Wednesday night or Thursday morning.
• 📍 The exact landfall location remains uncertain, with possibilities ranging from Southwest Louisiana to closer to Houston and Galveston.
• 🗓️ Further updates will be provided as the system evolves, with increased clarity expected by Wednesday night or Thursday morning.
• 💧 Regardless of intensity, the system is expected to bring significant rainfall to the region, with potential for 2-3 inches in Southeast Texas by Friday into Saturday.