The National Hurricane Center in Miami issued its eighth wind speed probability advisory for Tropical Storm Bertha at 9:00 a.m. Coordinated Universal Time on Tuesday, July 21, 2026.
At the time of the advisory, Bertha’s center was located near latitude 28.7 degrees North and longitude 86.4 degrees West, placing it over the Gulf of Mexico. The storm was producing maximum sustained winds of approximately 45 knots — equivalent to 50 miles per hour or 85 kilometers per hour.
The advisory outlines the likelihood of sustained wind speeds reaching at least 34 knots (39 mph), 50 knots (58 mph), and 64 knots (74 mph) at dozens of specific locations along the Gulf Coast over the next five days.
Among the higher probabilities noted, a grid point near 29.0 North, 87.0 West showed a 90 percent cumulative chance of experiencing 34-knot winds and a 34 percent cumulative chance of 50-knot winds. Pensacola, Florida, had a 4 percent cumulative chance of tropical-storm-force winds.
Further west along the Gulf Coast, Buras, Louisiana, carried a 24 percent cumulative probability of tropical-storm-force winds, while New Orleans and Houma, Louisiana, showed 8 and 11 percent cumulative chances, respectively.
Cameron, Louisiana, showed a 15 percent cumulative probability for 34-knot winds and a 3 percent cumulative chance for 50-knot winds by Thursday. Galveston, Texas, had a 12 percent cumulative probability of tropical-storm-force conditions over the five-day period.
The advisory was prepared by forecaster Papin at the National Hurricane Center.
