Extreme Heat Warning Covers Big Bend and Panhandle as a Record-Strength Heat Dome Sits Over Florida

An upper-level ridge strong enough to challenge monthly records for atmospheric pressure is parked over the Southeast, and Florida is spending the weekend underneath it. National Weather Service offices have an Extreme Heat Warning in effect for portions of the Big Bend and eastern Panhandle, where heat index values could reach 115 degrees, while heat advisories cover much of the rest of the state.

Central Florida is under its fourth heat advisory of the week, with heat index values forecast to exceed 108 degrees. South Florida has been under consecutive heat advisories for more than a week, with feels-like readings in the triple digits and the advisory extended through Sunday.

The distinction between the two alert types matters. A heat advisory means dangerous heat index values are expected. An Extreme Heat Warning, the higher-tier product, means the combination of temperature and humidity has reached a level the Weather Service considers a serious threat to anyone without adequate cooling, and it is issued sparingly even in Florida.

What is driving it

The mechanism is a heat dome, a persistent area of high pressure aloft that suppresses cloud formation and rainfall while forcing air downward, where it compresses and warms. Under a strong ridge, the afternoon thunderstorms that normally cap Florida's summer temperatures fail to develop, removing the state's most reliable natural air conditioning.

Forecasters have described this particular ridge as likely to break monthly records for the intensity of its high pressure, which is a technical way of saying the atmosphere is more strongly capped than it typically gets in August. As a result, dozens of temperature records, both daytime highs and warm overnight lows, are expected to fall across the South.

The overnight lows are the part meteorologists watch most closely for health effects. When nighttime temperatures fail to drop into a range that lets the body recover, consecutive days of heat exposure compound rather than reset. Florida's high dew points make that recovery particularly difficult, because the humidity that drives the heat index during the day does not clear at night.

Actual air temperatures across the state are climbing into the middle to upper 90s inland and the lower 90s along the coasts. Those numbers alone would be an ordinary Florida August. It is the humidity layered on top, pushing heat index values into the 105 to 112 range for most locations and higher in the Big Bend, that has generated the warnings.

Where the alerts stand

The Extreme Heat Warning covers portions of the Big Bend and eastern Panhandle. That region, which includes the Tallahassee area and the inland counties east and west of it, sits far enough from the moderating influence of coastal sea breezes to reach the highest afternoon values in the state.

Central Florida's heat advisory is the fourth of the week for the region, covering the Orlando metro and surrounding counties. Heat index values above 108 degrees have been the recurring threshold, and the repetition rather than any single day's peak is what has concerned emergency managers.

South Florida has been under an extended run of consecutive advisories, with the current one extended through Sunday. Palm Beach County has been included, and the Miami-Dade and Broward urban cores carry additional heat island effects that push nighttime temperatures higher than surrounding areas.

Alert boundaries follow National Weather Service county warning areas rather than media markets, so residents should check the specific product for their county rather than assuming a regional forecast applies to their location.

Who is most at risk

Outdoor workers carry the heaviest exposure. Florida's construction, agriculture, landscaping and roofing workforces spend the hottest hours of the day in direct sun, often performing physical labor that generates internal heat on top of environmental heat. Roofing work in particular puts workers on surfaces that run far hotter than ambient air temperature.

Older adults face elevated risk for physiological reasons. The body's ability to regulate temperature through sweating declines with age, thirst signaling weakens, and common medications including diuretics and some blood pressure drugs interfere with heat regulation. Florida's older population is the largest in the country by share, which raises the state's aggregate exposure.

Young children, people with chronic cardiovascular or respiratory conditions, and anyone without reliable air conditioning are also in the higher-risk categories. Power outages during heat events convert an inconvenience into an emergency, which is why utilities and emergency managers monitor grid load closely during extended heat.

Pets and vehicles round out the standard warnings. Vehicle interiors reach lethal temperatures within minutes under Florida sun, and pavement temperatures can injure animals walked during the afternoon.

What officials recommend

The core guidance during extreme heat is straightforward and does not change much event to event. Limit outdoor activity to early morning and evening hours. Drink water consistently rather than waiting for thirst. Wear light-colored, loose clothing. Take breaks in air conditioning or, failing that, in deep shade with air movement.

Recognizing heat illness matters as much as preventing it. Heat exhaustion presents with heavy sweating, weakness, nausea, headache and cool clammy skin, and it responds to moving to a cooler place, loosening clothing and drinking fluids. Heat stroke, marked by a high body temperature, confusion, and skin that may be hot and dry, is a medical emergency requiring an immediate call to 911.

Many Florida counties open cooling centers during extended heat events, typically in libraries, community centers and recreation facilities. Availability varies by county and is announced through county emergency management channels rather than statewide.

Employers in Florida operate under federal Occupational Safety and Health Administration guidance on heat rather than a state-specific heat standard. That guidance emphasizes water, rest, shade and acclimatization for new workers, who account for a disproportionate share of serious heat illness cases.

The tropics, meanwhile, stay quiet

The same ridge suppressing rainfall is part of a broader pattern that has kept the Atlantic basin unusually quiet. The National Hurricane Center has been tracking a small number of tropical disturbances, with development chances that have been revised downward as Saharan dust and upper-level winds have interfered.

The 2026 season has produced two named storms, Arthur and Bertha, and no hurricanes through mid-August. NOAA has maintained its below-normal seasonal outlook, calling for 7 to 13 named storms, 2 to 6 hurricanes and 0 to 2 major hurricanes, with a 75 percent chance of below-normal activity overall.

A quiet tropics is not an unmixed blessing during a heat event. Tropical moisture and the disturbances that come with it break heat domes, and their absence is part of why this ridge has held. Florida's rainy season pattern has been suppressed across much of the state during this stretch.

How Florida's heat has changed

Florida has always been hot in August, but the specific metric that drives heat illness has been trending upward. Overnight low temperatures have risen faster than daytime highs across much of the state, and the number of nights that fail to drop below thresholds allowing physiological recovery has increased.

Urban heat island effects compound the pattern in Florida's metropolitan cores. Paved surfaces and buildings absorb heat during the day and release it slowly at night, which can leave downtown Miami, Tampa and Orlando several degrees warmer overnight than surrounding areas. Neighborhoods with less tree canopy experience the effect most strongly.

Humidity is the variable that makes Florida heat distinct from heat in the desert Southwest. The body cools primarily by evaporating sweat, and evaporation slows as the air approaches saturation. A 95-degree day at a high dew point is physiologically more dangerous than a 105-degree day in dry air, which is why the heat index rather than the temperature drives the alerts.

Emergency departments across Florida see heat-related visits climb during extended events, concentrated among outdoor workers, older adults and people experiencing homelessness. Those patterns are consistent enough that health systems in the state plan staffing around them.

The grid and the cost of cooling

Extended heat drives electricity demand to its annual peak, and Florida's utilities plan generation and transmission capacity around exactly these conditions. Air conditioning accounts for a large share of residential electricity use in the state, and sustained heat means those systems run nearly continuously.

The bills that follow arrive weeks later. Florida households already carry among the higher average residential electricity consumption levels in the country because of cooling load, and an extended August heat event produces September bills that strain budgets already pressured by insurance and housing costs.

Utility assistance programs exist through the Low Income Home Energy Assistance Program, administered in Florida through local community action agencies, and through utility-specific hardship funds. Those programs have historically been oriented toward heating assistance nationally, and cooling assistance has been a growing share of the need in southern states.

Grid reliability during peak demand is the operational concern. Florida's utilities have generally managed summer peaks without rolling outages, but the combination of extended heat and any generation or transmission failure creates a public health emergency rather than an inconvenience, because loss of air conditioning during a heat dome is dangerous rather than uncomfortable.

What's next

The heat is forecast to continue into next week across the South, with dozens of temperature records in play. Forecasters expect the ridge to persist rather than break down quickly, meaning the current advisory and warning products are likely to be reissued day to day rather than expiring.

Residents should check their local National Weather Service office forecast each morning, because heat index values shift with dew point and cloud cover in ways that daily highs alone do not capture. The Weather Service offices covering Florida issue updated products in the morning for the coming afternoon.

The Florida Division of Emergency Management maintains statewide weather information, and county emergency management offices publish cooling center locations and local guidance. For anyone working outdoors this weekend, the practical checkpoint is the afternoon heat index forecast for their specific county rather than the statewide picture.