The National Weather Service in Miami on Sunday issued tornado warnings for a wide swath of Monroe, Miami-Dade and Broward counties in South Florida.
Officials said the band of rain- and tornado-producing cells was moving quickly.
There were no immediate reports of tornadoes touching down.
The new warning Sunday morning came a day after a string of tornadoes ripped through South Florida as the heavy squalls from Irma pushed along the coast. As many as nine tornado warnings were issued in Miami-Dade and Broward counties in the span of two hours.
A funnel cloud formed off Fort Lauderdale Beach around 6 p.m. just as tornado warnings were issued throughout Broward County. Cellphone video from NBC 6 viewer Gabriel Benedik showed the funnel cloud as it moved from the shore over to land.
A tornado touched down in Oakland Park just before 7 p.m., the National Weather Service said. The tornadic activity was detected from Fort Lauderdale Beach moving west toward Tamarac and Sunrise. Tornadoes were also detected in Miramar and Davie.
There were multiple toppled trees and downed powerlines in Cutler Bay after a possible tornado touchdown in the area.
South Florida experienced the tornadic activity as the "dirty side" of Hurricane Irma swirled by Saturday evening and Sunday. The "dirty side" of a hurricane typically carries the heaviest rain, strongest hurricane winds and tornadoes.