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The hail was heavy downtown Friday afternoon, as seen in this video by NBC 6's Diana Gonzalez.
Three males were hit by lightning and one went into cardiac arrest but was revived in South Dade Friday, fire officials said.
The trio were struck by lightning while working on a pickup truck at SW 320th Street and SW 162nd Avenue, Miami-Dade Fire Rescue spokesman Lt. Arnold Piedrahita said.
The male who was revived by Fire Rescue personnel along with a second victim who suffered burns were taken by air to Ryder Trauma Center at Jackson Memorial Hospital, Piedrahita said.
The third victim had minor injuries and was taken to a hospital in Homestead.
The incident occurred on an intense weather day, as a severe thunderstorm watch was in effect until 9 p.m. in South Florida, the National Weather Service said.
Two-inch-wide hail was reported in Coral Gables, and hail the size of a golf ball was seen in Coconut Grove, the National Weather Service said.
Hail with a one-inch diameter was reported in downtown Miami and Oakland Park. Nickel-sized hail was reported in mainland Monroe County, and "marble-sized hail" near SW 57th Avenue and the Palmetto Expressway, the NWS said.
Meantime, rain slowed the evening commute.
A line of strong thunderstorms, moving southeast at 15 mph, was forecast to affect South Miami, Key Biscayne, Pinecrest, Cutler Ridge, Cutler Bay and surrounding communities, the National Weather Service said.
A wind gust of 53 mph was recorded at Boca Raton Airport.
Stay with NBCMiami.com and NBC 6 for updates.