As Hurricane Helene makes its way through the Gulf of Mexico, the National Hurricane Center is closely monitoring two other developing systems in the Atlantic.
The first, a broad low-pressure system identified as AL98, is situated near the Cabo Verde Islands and is producing disorganised shower and thunderstorm activity. Conditions are favourable for gradual development, with an estimated 60% formation chance.
The second system, AL99, is a low-pressure area located off Bermuda. This system is currently producing storm-force winds. The formation chance for AL99 is low at 10% in the next 48 hours, with a slight increase to 20% over the following week.