The National Hurricane Center in Miami officially upgraded a low-pressure system near the middle Texas coast to Tropical Storm Arthur on Wednesday morning, June 17, 2026, citing growing evidence of tropical storm conditions developing around the storm’s center.
Forecasters say the system has been producing sustained thunderstorm activity well to the east of its center. A morning analysis using a standard storm classification method found enough organization to designate it as a sheared tropical cyclone. Buoy readings and a report from a nearby ship confirmed tropical-storm-force winds within that storm activity. Air Force Reserve Hurricane Hunter aircraft flying into the storm recorded peak upper-level winds of up to 52 knots, further supporting the tropical storm designation. Based on all of that data, Arthur was assigned an initial intensity of 35 knots.
The storm is beginning to pick up speed, moving to the northeast at about 8 knots as stronger winds in the atmosphere push it along. Forecasters say Arthur’s center is expected to move along or over the Texas coast Wednesday and then push inland across southeastern Texas and into southwestern Louisiana by Wednesday night. The forecast track has not changed significantly from earlier projections.
Forecasters do not expect much additional strengthening before the storm moves ashore. Strong winds from the west are tearing at the storm’s structure, and its close proximity to land limits any further development. Tropical-storm-force winds are currently confined to the eastern side of the storm and are mainly affecting offshore waters. Arthur is expected to hold its current intensity while over water, then begin weakening once it moves inland Wednesday night. Computer weather models suggest the storm will break apart into a trough of low pressure shortly after landfall, and forecasters expect Arthur to fully dissipate before the 24-hour forecast point — though that point was included in the forecast for consistency.
Weather models are also showing a signal for possible low-pressure development over the western Atlantic later this week or into the weekend, as energy from Arthur emerges off the southeastern U.S. coastline. Forecasters say the exact nature of that potential system is still unclear and will continue to be monitored for any signs of tropical cyclone formation.
The primary danger from Arthur is heavy rainfall and life-threatening flash flooding. The Tropical Storm Warning has been extended westward along the upper Texas coast to High Island based on the latest observations.
Key Hazards:
Potentially life-threatening flash flooding and urban flooding are expected through Friday across southern Louisiana, southern Mississippi, southern Alabama, southwestern Georgia, and the Florida Panhandle, with possible flooding near the upper Texas coast. Heavy ongoing rainfall could extend the flood threat into the weekend.
Tropical-storm-force winds are expected along the upper Texas and Louisiana coasts Wednesday, from High Island to Morgan City, where a Tropical Storm Warning is currently in effect.
Minor to moderate coastal flooding is also expected along portions of the upper Texas and Louisiana coastlines Wednesday.
The forecast calls for Arthur to be at 30 knots and inland by Wednesday night, weakening to 20 knots by Thursday morning, and fully dissipated by Thursday evening. This forecast was prepared by Forecaster Reinhart.
