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NEXT Weather Alert day issued in South Florida due to extreme, possibly record-breaking heat on Thursday

The CBS News Miami NEXT Weather team has declared Thursday a NEXT Weather Alert day due to dangerous heat expected later.

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This graphic provides information the NEXT Weather Alert day that's in effect across South Florida on Thursday, June 18, 2026. CBS News Miami

A heat advisory is in effect for all of South Florida, including Broward, Miami-Dade and mainland Monroe counties from noon until 7 p.m. due to the feels-like temperatures that could reach 105 to 110 degrees.

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This graphic shows the heat advisories that are in effect in South Florida on Thursday, June 18, 2026. CBS News Miami

There is also mostly a major risk of heat-related illness for South Florida on Thursday. That means that without the proper cooling and/or hydration, heat exhaustion and heat illness will be possible.

A few areas may experience an extreme risk of heat-related illness due to little or no overnight relief.

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This graphic shows the heat-related health risk on Thursday, June 18, 2026. CBS News Miami

It already felt like it was in the 90s early Thursday morning, and this afternoon will be brutal with heat indices in the triple-digits.

Residents across South Florida should take the necessary precautions to avoid heat-related illness.

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This graphic provides heat safety tips. CBS News Miami

Some heat safety tips include staying hydrated, wearing light-colored and loose-fitting clothing, staying in the shade or air conditioning or taking frequent breaks if you do need to be outside today.

Thursday will be mostly dry with only a few showers possible. We need the rain since we are now tracking three wildfires in western Miami-Dade County.

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This graphic shows the forecast feels-like temperatures in South Florida on Thursday, June 18, 2026. CBS News Miami

The Well Fire has burned 500 acres and is 25% contained. The Quarry 2 Fire has burned 15,900 acres and is 50% contained.

The breeze has shifted out of the southeast and that will help to steer the smoke towards the west and northwest on Thursday.

Hazy conditions are likely across Alligator Alley and over the Florida Everglades for people traveling towards the interior and out west.

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This graphic shows information about record heat that is possible in South Florida on Thursday, June 18, 2026. CBS News Miami

Due to the onshore flow and much of the smoke being pushed away from the metro areas, air quality has improved a bit over Broward and portions of northwest Miami-Dade with good air quality for these areas now.

But the air quality is still moderate for much of Miami-Dade County.

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This graphic shows the air quality in South Florida on the morning on Thursday, June 18, 2026. CBS News Miami

The chance of rain will increase on Friday for Juneteenth with passing showers and some thunderstorms possible.

It will be another scorcher with high temperatures in the low 90s and feels-like temperatures in the 100s again.

This weekend is looking wetter as moisture will move in and increase the potential for scattered showers and thunderstorms on Saturday and Sunday for Father's Day.

High temperatures will remain in the low 90s with the rain proving a little relief from the extreme heat.

Rain chances will decrease next week.

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