Atlantic Storm Systems Developed This Week
Invest 91L entered the Atlantic while Tropical Depression Fay weakened into a post-tropical cyclone.
Updated on Sept. 28, 2026 in Current Conditions
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A new weather system, Invest 91L, has emerged in the Atlantic with wind speeds between 30 and 35 mph. Meanwhile, Tropical Depression Fay is transitioning into a post-tropical cyclone due to wind shear and stable air.
Why it matters
The development of these systems highlights the impact of upper-level wind shear and troughs on tropical activity. Residents are tracking these shifts as the region transitions out of a period of dry weather.
Invest 91L currently maintains wind speeds of 30-35 mph, while potential rainfall totals across the region may reach 3 inches. Highs in the 90s are expected to persist through Wednesday.
The players
Invest 91L
This is a developing weather system currently moving through the Atlantic.
Tropical Depression Fay
This system is currently weakening as it transitions into a post-tropical cyclone.
The details
Upper-level wind shear continues to affect the Caribbean and Atlantic, keeping tropical activity at bay by disrupting storm organization. An upper-level trough is moving into the region, contributing to the weakening of Tropical Depression Fay.
Timeline
September 28, 2026: Dry weather begins with highs in the 90s.
September 30, 2026: The dry weather period is expected to end.
Late September 2026: Tropical Depression Fay transitions into a post-tropical cyclone.
Seasonal Patterns
These systems have emerged following a period that recently broke the record for the longest duration without a hurricane in the region. The activity highlights how atmospheric troughs and wind shear continue to dictate the frequency of tropical disturbances.
Residents in Lafayette should prepare for potential rainfall accumulation of up to 3 inches as these systems progress. It is advised to monitor local alerts for updates on the transition of Tropical Depression Fay and potential development of Invest 91L.
The takeaway
Ongoing wind shear is playing a critical role in limiting storm intensity in the Atlantic. Staying informed on meteorological updates is the best way to prepare for shifting conditions as high temperatures persist through mid-week.
Further reading
For more information on local weather, visit Current Conditions.
Source note: This article includes information reported by Acadiananewsfirst.
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