The National Hurricane Center in Miami issued Wind Speed Probability Update Number 8 for Post-Tropical Cyclone Arthur at 3:00 a.m. Coordinated Universal Time on Thursday, June 18, 2026.
At the time of the bulletin, the center of the post-tropical system was located near latitude 29.7 degrees north and longitude 94.5 degrees west. The storm was carrying maximum sustained winds of approximately 30 knots, which equals about 35 miles per hour or 55 kilometers per hour.
The bulletin was designed to provide the probability of sustained wind speeds reaching at least 34 knots (39 mph), 50 knots (58 mph), and 64 knots (74 mph) at specific locations over the following five days. However, forecasters noted that no official forecast existed for the applicable date and time window, meaning no wind speed probability calculations could be generated for any of the listed locations.
The update was issued by Forecaster Beven.
