Invest Name: 91L
Possible Named Storm: Gabrielle
- Invest 91L is currently being monitored in the eastern Atlantic by the National Hurricane Center (NHC).
- “Invest” is a designation used by the NHC for areas of potential tropical development that are being closely watched for possible formation within the next 7 days.
- As of September 5, 2025, the system has a 40–60% chance of developing into a tropical depression in the next 48 hours, and a 70–90% (up to 90% in some forecasts) chance over the next 7 days.
- The disturbance is moving slowly westward at about 5–10 mph. It originated as a tropical wave off the coast of Africa and has developed into a low pressure system with disorganized showers and thunderstorms.
- Environmental conditions are generally favorable for further development, but the system must overcome pockets of dry air in the region, which could slow intensification.
- If it develops into a tropical storm, it will be named Gabrielle according to the 2025 Atlantic hurricane naming list.
- The system is expected to approach the Lesser Antilles by mid-to-late next week. The long-term track is still uncertain, with model guidance spread out and the possibility of a variety of outcomes.
- A series of weather fronts in the southeastern U.S. may act as a steering mechanism to keep the system away from the mainland, but it is too early to determine any direct impacts for the U.S. or Caribbean.
- This activity is occurring near the climatological peak of hurricane season (around September 10), when conditions in the Atlantic are most favorable for tropical cyclone formation.
- The National Hurricane Center and meteorologists recommend monitoring updates frequently, as the situation can change rapidly during this active period.
Satellite Imagery:
Source: NOAA GOES-East
Last updated: September 5, 2025