Atlantic Hurricane Outlook – August 4, 2025: Tropical Storm Dexter Forms; Two Other Systems Under Watch
*Those who like data, continue reading. Those it prefer the quick version, jump to the TL;DR here.
Tropical Storm Dexter has developed in the western Atlantic, while two additional systems are being monitored for potential development. Conditions across the basin remain dynamic—with storm formation possible in coming days.
Atlantic Basin Summary
Tropical Storm Dexter: The fourth named storm of the 2025 season formed late Sunday night, now located ~255 miles northwest of Bermuda. Maximum sustained winds are 45 mph, and the system is moving east-northeast. It’s expected to remain over open water and become post-tropical by Wednesday with no threat to U.S. land.
Disturbance AL95: A non-tropical low pressure area off the Southeast U.S. coast is being monitored with medium (30%) development chance over 7 days. Movement is east-northeast under weak shear, and formation may remain offshore.
New tropical wave emerging off Africa (~30°W): Forecast to track westward with scattered convection. The formation chance is 50% over 7 days, indicating growing potential for a tropical depression if favorable conditions develop.
Environmental Conditions
Sea Surface Temperatures (SSTs):
Waters in the Gulf of Mexico, Caribbean, and MDR remain warm at 29–31°C (84–88°F)—providing ample energy if atmospheric conditions become supportive.Wind Shear:
Still moderate to high across much of the Atlantic, limiting vertical storm structure. However, shear may relax in the western basin later this month.Saharan Air Layer (SAL):
Persistent dry, dusty air continues to suppress convection, especially over the eastern and central Atlantic. This remains a major inhibiting factor for newly emerging systems.Moisture:
Improving moisture levels seen in the western Caribbean and Gulf, though much of the basin remains too dry for sustained disturbance development.
Gulf of America (Mexico) & Caribbean Region
No tropical systems currently forming.
A dominant high-pressure ridge promotes generally calm, hot conditions across the Gulf and Caribbean.
Scattered showers remain typical for August, with no organized convection tied to tropical disturbances.
GOES-19 - Sector view: Gulf
GOES-19 - Sector view: Caribbean
Florida Forecast
Highs: Upper 80s to near 90°F under humid conditions.
Afternoon thunderstorms: 40–50% chance, typically from sea breeze convergence—non-tropical in origin.
Winds: Light and variable inland; southeasterly near the coast.
No tropical storm impacts are expected today.
Rain forecast visualization courtesy of Windy.com
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Looking Ahead
Though Dexter poses no immediate risk to land, the emerging wave and mid-Atlantic trough (AL95) warrant attention. The signal is clear: early August may mark the beginning of a more active period in the tropical Atlantic.
TL;DR – August 4, 2025 Summary
Tropical Storm Dexter forms off the East Coast—staying far offshore and weakest by midweek.
Low pressure (AL95) offshore Southeast U.S. with 30% development chance.
New wave off Africa (~30°W) entering the Atlantic—50% chance of development in 7 days.
SSTs supportive but SAL and shear remain inhibitory.
No threat to Florida; typical summer thunderstorms expected.
