Severe thunderstorms capable of damaging winds, large hail and intense lightning are expected to move through Palmetto Bay and Cutler Bay between 1 p.m. and 7 p.m. Friday, compounding a heat advisory already in effect across Miami-Dade County.

Heat Advisory Covers Both Communities

The National Weather Service in Miami issued the heat advisory at 2:50 a.m. Friday for Metropolitan Miami-Dade and Coastal Miami-Dade counties. Both Palmetto Bay and Cutler Bay fall within those zones. The advisory runs from 11 a.m. to 7 p.m. and forecasts heat index values between 105 and 110 degrees.

Thursday reached 97 degrees in South Florida, the hottest day of the year so far, according to WPLG Local 10 meteorologist Brandon Orr.

Storm Timeline: Afternoon Buildup, Evening Peak

Orr said the first storms will develop between 1 p.m. and 3 p.m. Friday, with the highest chance of severe weather from 3 p.m. to 7 p.m.

"The difference today will be the development of more widespread showers and thunderstorms," Orr wrote in his Friday forecast. "Some could be severe with intense cloud-to-ground lightning, damaging wind gusts and hail."

CBS Miami's Next Weather team also reported that feels-like temperatures could reach 110 degrees Friday as rain chances increase.

How to Stay Safe

The combination of extreme heat and severe storms creates a narrow window of danger for anyone working or exercising outdoors. The weather service advises residents to:

— Drink plenty of water, even without feeling thirsty.
— Stay in air-conditioned buildings when possible.
— Avoid strenuous outdoor activity during the hottest hours.
— Wear lightweight, loose-fitting clothing.
— Check on relatives, neighbors and others who may be vulnerable.
— Never leave children or pets unattended in vehicles.

For lightning safety, the weather service's standard guidance is simple: When thunder roars, go indoors. Stay inside for at least 30 minutes after the last clap of thunder.

Residents seeking a cooling center can call Miami-Dade County's 311 helpline or visit miamidade.gov for current locations.

More Heat, Storms Expected Through the Weekend

Orr said additional hit-or-miss thunderstorms are likely Saturday and Sunday, fueled by temperatures remaining in the mid-90s. More heat advisories are likely well into next week, though the weather service has not yet issued specific future advisories.