Isaias loses tropical strength as inland flood risk persists
Isaias became a post-tropical cyclone over Alabama on 10 October as sustained winds fell to 55 kilometres per hour. Storm-surge and tropical-storm warnings ended, but forecasters continued to warn of flooding across parts of the southeastern United States. The remaining hazards include flash and river flooding, possible landslides and dangerous coastal currents as the system moves inland.
Science··Midday
Isaias becomes post-tropical over Alabama
Isaias became a post-tropical cyclone as it moved inland into Alabama on 10 October. It had lost its tropical characteristics after crossing the coast into the southeastern United States.[1], [2]
The National Hurricane Center, the US agency that tracks hurricanes, placed the centre about 40 kilometres south-southwest of Montgomery, Alabama. Sustained winds had fallen to 55 kilometres per hour, with stronger gusts. It was moving north at 22 kilometres per hour. The centre discontinued all storm-surge and tropical-storm warnings.[1]
Rainfall sustains the inland flooding hazard
Forecasters continued to warn of considerable flooding impacts across southern Alabama, the Florida Panhandle and Big Bend, and southwestern Georgia. These Florida regions lie along the state’s northwestern Gulf coast. Flash, urban and river flooding remained possible. The Southern Appalachians also faced a risk of considerable flash flooding and landslides. Tornado risks persisted in parts of eastern Florida’s Panhandle, Georgia and the Carolinas.[1]
Coastal currents remain dangerous as the system moves north
The hurricane centre forecast movement through Alabama toward the Tennessee Valley, followed by a turn northeast and dissipation on Sunday. Water levels along Florida’s Gulf Coast were expected to recede, while dangerous surf and rip currents could continue along Gulf coasts in the United States, Mexico and western Cuba. The National Hurricane Center issued its final public advisory, handing subsequent updates to the Weather Prediction Center.[1]
