A viewer's photo shows ominous clouds over Fort Lauderdale on Saturday.
The effects of Tropical Storm Isaac are already being felt in South Florida early Sunday morning.
According to Florida Power & Light, 4,500 people had no power in Miami-Dade and 1,800 people in Broward.
WATCH: Extended Isaac Coverage
FPL did not specify the amount of outages in Monroe County but said they were minor.
Greg Brostowicz, a spokesperson for FPL said 2,000 out-of-state crews were making their way to Florida to aid local teams.
"We want to get as many trucks and crews into this to restore power as quickly and safely as possible," he said. "These strong squalls are starting to come in now."
Brostowicz said residents can call, visit their mobile-friendly website, Facebook page or Twitter feed to report outages or obtain information. He urged residents to call 911 or FPL if they see downed power lines.
"If they see power lines down, stay away, treat them as live," he said.
Though crews will work to restore power to homes as quickly as possible, Brostowicz said once winds get above 30 mph, it would no longer be safe for crews to work outside.
What's Open, What's Closed for Tropical Storm Isaac
As of 5 a.m., Isaac was a little stronger and had maximum sustained winds near 65 mph as it moved northwest at 18 mph about 205 miles east-southeast of Key West and 215 miles east of Havana, Cuba.
Stay with NBC6.com for updates.
