Tropical Storm Bertha strengthened over the Gulf of Mexico on July 21, 2026, tracking slowly toward the Florida Panhandle and Alabama with maximum sustained winds of 60 mph. The National Hurricane Center (NHC) issued tropical storm warnings stretching from the Florida-Alabama border west to the Jefferson-Plaquemines parish line in Louisiana.

As of Tuesday afternoon, Bertha was about 125 miles (201 km) southeast of Mobile, Alabama, moving northwest at just 5 mph (8 km/h). The storm's winds had increased by 20 mph since it formed as a tropical depression (a weaker, less organized system) off Florida's Gulf Coast on July 19. It reached tropical storm strength on the evening of July 20 and kept gaining power the next day. The NHC issued its first advisory on July 19 and followed with nine numbered advisories and nine intermediate public advisories at three-hour intervals through July 21 (NHC archive).

The NHC's Advisory Number 9, issued at 1500 UTC (10:00 AM CDT) on July 21, upgraded the Tropical Storm Watch (conditions possible) to a Tropical Storm Warning (conditions expected) for the Florida/Alabama border area, extending east to the Bay/Gulf County line. At that point, Bertha was moving north-northwest at 3 knots (NHC Advisory 9). Earlier that day, Advisory Number 8a at 7:00 AM CDT reported Bertha moving northwest at 320 degrees with a minimum central pressure of 29.44 inches of mercury (NHC Advisory 8a). A storm surge watch (meaning dangerous coastal flooding is possible) was issued from the Alabama-Florida border to the mouth of the Mississippi River, and marine warnings remained in effect for the Gulf and Eastern Pacific (NHC homepage).

The NHC warned of potentially life-threatening storm surges (ocean water pushed inland by the storm) of up to 4 feet (1.2 meters) in parts of Louisiana, Alabama, and Florida. Bertha was expected to stay near or along the northern Gulf coast, dumping heavy rain across coastal areas of Florida, Alabama, Mississippi, and Louisiana while drifting west toward Texas. Rainfall totals of 3 to 5 inches (7 to 12 cm) were forecast along the Louisiana coastline, with higher amounts in scattered areas. Flash flooding was possible through Friday along the coast from western Florida to middle Texas. The NHC also cautioned that Bertha could produce an isolated tornado or two over the Florida Big Bend region.

Reuters noted that Bertha had a noticeably lopsided, asymmetrical appearance on July 21 as it tracked along the Gulf Coast. This structural feature often signals wind shear (upper-level winds that can tear at a storm's organization) displacing thunderstorm activity from the storm's center, which can complicate rainfall distribution forecasts.

On the ground, preparations were underway in vulnerable coastal communities. Red flags were posted on the beach at Orange Beach, Alabama, warning swimmers of high surf and dangerous currents. In Escambia County, Florida, emergency officials provided sand to residents in flood-prone areas for sandbag use.

Bertha is the second named tropical storm of the 2026 Atlantic hurricane season. Tropical Storm Arthur, the first, brought heavy rainfall to the southeastern United States in June. NOAA's seasonal outlook, published May 21, predicted a 35% chance of a near-normal season, placing Bertha's development within the range of expected early-season activity (NOAA).

The broader context here is one of slow-moving Gulf systems that maximize rainfall and surge exposure even at tropical-storm intensity. Bertha's forward speed of just 5 mph means prolonged onshore flow along the northern Gulf shelf, which amplifies storm surge beyond what wind speed alone would suggest. The asymmetry Reuters flagged also matters operationally: the heaviest rainfall may fall well east or west of the center, complicating evacuation and resource pre-positioning decisions for emergency managers across four states. With the system expected to linger along the coast through Friday, the cumulative rainfall threat may ultimately prove more consequential than the wind hazard, particularly for low-lying areas in Louisiana and Mississippi that are still assessing drainage capacity after earlier summer precipitation.