Subtropical Storm Deni (Potential Scenario)

Note: Work in Progress.

Subtropical Storm Deni was a rare, short-lived subtropical cyclone in the South Atlantic basin. Deni was the first tropical storm strength subtropical or tropical cyclone since Subtropical Storm Cari of March 2015. Deni was only the fourth named storm since the Brazilian Navy Hydrographic Center started naming South Atlantic subtropical and tropical cyclones in 2011, demonstrating the rarity of storms in the basin. Deni had no impacts and only caused 1 fatality.

Meteorological History
About 2 weeks to initial formation, models were in good agreement that weak to moderate subtropical or tropical cyclone would develop in the South Atlantic, a rare occasion due to usually highly unfavorable conditions, with persistent large amounts of wind shear. Models remained strangely consistent, and approximately 4 days prior to Dani's formation, an extratropical cyclone branched north as it continued to move eastward. As the branch of the main extratropical cyclone exited off the coast of South America, a separate low pressure developed on August 10. This low pressure continued to move steadily eastward as the branch of the extratropical cyclone began to retreat back south. Development was inhibited due to the fact that the low pressure was connected to a frontal system.