Most of Florida is under an extreme heat warning, heat watch, or heat advisory this week, with forecast heat indices reaching 115 degrees, and the state has already set records.
Tampa recorded an actual air temperature of 100 degrees on July 27, the hottest reading since the city began keeping records in 1890. The following day its heat index reached 118, tying a mark set in August 2000, according to National Weather Service Tampa Bay meteorologist Stephen Shiveley.
The National Weather Service office in Tallahassee put it plainly in its own advisory language, telling residents to "take every precaution to stay cool in this high-end heat."
For most healthy adults, this is a miserable week that requires sense. For two groups, it is a medical risk, and both share the same problem: their bodies do not shed heat efficiently, and neither reliably communicates distress before it becomes serious.
Where the Warnings Are and What the Numbers Mean
Coverage is broad and shifting daily. Extreme heat warnings, extreme heat watches and heat advisories have been in effect across the Panhandle, Big Bend, North and Northeast Florida, and east central Florida including the Orlando area northward. South Florida has been the consistent exception, with temperatures in the 90s that fall below alert thresholds.
Jacksonville and Northeast Florida have seen forecast heat indices of 108 to 115 with warnings running from midday into early evening. Tallahassee and the central Panhandle have run highs of 96 to 100 with indices of 106 to 112. Pensacola and the western Panhandle have seen upper 90s with indices of 108 to 112. North Central Florida around Gainesville drew an extreme heat watch for Wednesday with peak indices of 107 to 115.
The tiers matter less than most coverage suggests, but the criteria are worth knowing. A heat advisory generally requires a maximum heat index of 100 degrees or higher for at least two days with overnight lows not dropping below 75. That second condition is the one that does the damage. When the night does not cool, the body never gets its recovery window, and risk accumulates across days rather than resetting each morning.
One technical point that changes behavior: heat index values are calculated for shade and light wind. Direct sun can add 15 degrees or more to the effective value. A forecast index of 110 describes conditions considerably less severe than standing in a Florida parking lot at 3 p.m.
Why Older Adults and Young Children Are Different
Thermoregulation is a system, and it degrades at both ends of life.
With age, the body sweats less and starts sweating later. Cardiac output rises less readily to move blood to the skin. The thirst signal weakens, so an older adult can be meaningfully dehydrated without feeling thirsty. Chronic conditions common after 65, including heart disease, kidney disease and diabetes, further reduce the margin. Many older adults also take medications that blunt thirst, impair sweating or limit blood vessel dilation, and mobility limits can prevent someone from getting to a cooler place even when they recognize they should.
Young children have a different set of disadvantages. They have more body surface area relative to their mass, so they absorb environmental heat faster. Their sweating capacity is lower. Infants and toddlers also cannot remove their own clothing, get their own water, or tell a caregiver that something is wrong. They depend entirely on an adult noticing.
The behavioral overlay is what makes both groups dangerous to leave alone. Older adults living independently often resist turning on air conditioning because of utility costs, and frequently do not want to be moved. Children do not stop playing.
Federal guidance from the Environmental Protection Agency names the same higher-risk groups: adults 65 and older, infants and children, people with chronic conditions, people without air conditioning, outdoor workers and athletes training outdoors.
The single most effective intervention is not complicated. Someone should physically check on an isolated older relative or neighbor during an event like this, in person, not by phone. People do not reliably notice heat overwhelming them.
The Fan Problem
This is the most common household mistake of the week, and the guidance runs against intuition.
The CDC has long advised that when the temperature is in the high 90s, electric fans will not prevent heat-related illness. The EPA's guidance is more specific: do not use electric fans for cooling when room temperature is in the mid-90s or higher, and do not run a fan in a closed room. Ready.gov describes fans as creating "airflow and a false sense of comfort" without reducing body temperature.
The mechanism is straightforward. A fan cools by helping sweat evaporate. Once the surrounding air is hotter than the skin, moving that air across the body adds heat rather than removing it, the way a convection oven works.
There is genuine scientific debate about the exact threshold, and recent work suggests fans may retain benefit at higher temperatures in humid conditions, which describes Florida. But the household rule that follows from the official guidance is sound: a fan is a supplement to air conditioning or ventilation, not a substitute for it. If an indoor space is in the mid-90s, the answer is relocating to a cooled space, not aiming a fan at someone.
Fans still have a legitimate use. Positioning one to exhaust hot air out a window or draw cooler air in moves the room temperature down, which is different from blowing hot air at a person.
Households without working air conditioning should identify a cooling location before they need it. Libraries, shopping centers, and county cooling centers are the usual options, and county emergency management pages list current hours. Anyone facing utility shutoff during a heat event can contact their utility about payment arrangements, and Florida operates energy assistance programs.
Cars, and the Warning That Repeats Every Summer
Vehicle interiors heat far faster than most people estimate, and they keep climbing well past the outside temperature. Cracking a window does not meaningfully change that.
No child should be left in a parked car in these conditions, for any duration, including the length of a quick errand. The same applies to pets and to older adults with limited mobility who cannot exit a vehicle on their own.
The practical countermeasure is a habit rather than an intention. Put something you need at your destination in the back seat, so that reaching the back is not optional. Most hot car deaths involve a caregiver who did not intend to leave the child, and a system that does not depend on memory is the one that holds on a day when the routine changes.
What to Watch For and What Happens Next
Heat exhaustion typically presents as heavy sweating, cool and clammy skin, weakness, dizziness, headache, nausea, and a fast, weak pulse. In an older adult, it can look like unusual fatigue or mild confusion. In a young child, it can look like fussiness, refusing to drink, or unusual sleepiness. Moving to a cool place, loosening clothing, sipping fluids, and applying cool cloths usually resolves it. Symptoms that persist beyond an hour warrant medical guidance.
Heat stroke is a different event and an emergency. The signs are body temperature above 103 degrees, skin that is hot and either dry or damp, rapid strong pulse, confusion, slurred speech and loss of consciousness. Sweating may stop entirely.
The federal response guidance is to call 911, move the person to a cool shaded area, remove outer clothing, and apply cold wet cloths or ice packs to the head, neck, armpits, and groin, or soak their clothing with cool water, while waiting for help. Do not give fluids to someone who is confused or not fully alert.
The National Weather Service updates alerts daily, and the pattern is forecast to persist through the week before a front brings storm chances. Residents should check their county's current alert rather than assume yesterday's status holds.
The confirmed facts are that most of Florida is under heat alerts with indices to 115, and that Tampa has set and tied heat records this week. The people most affected are adults over 65, infants and young children, and anyone without reliable air conditioning. The most reasonable action is an in-person check on an isolated older relative and a plan for where to go if a home gets too hot. The central uncertainty is how long the pattern holds.
Frequently Asked Questions
Which parts of Florida are affected? Extreme heat warnings, watches, and advisories have covered the Panhandle, Big Bend, North and Northeast Florida, and east-central Florida, including Orlando northward. South Florida has stayed below alert thresholds.
Is a fan enough if I do not have air conditioning? No. CDC guidance says fans will not prevent heat-related illness when temperatures are in the high 90s, and EPA advises against using them for cooling in mid-90s rooms.
Why are older adults at higher risk? They sweat less and later, feel thirst less reliably, often take medications that impair heat tolerance, and may have mobility limits that prevent reaching a cooler place.
What should I watch for in a young child? Fussiness, refusing fluids, unusual sleepiness, reduced urination, and flushed skin. Children cannot reliably report that they are overheating.
How do I tell heat exhaustion from heat stroke? Heat exhaustion involves heavy sweating, clammy skin, and dizziness and improves with cooling. Heat stroke involves temperature above 103 degrees, hot skin and confusion, and requires a 911 call.
Where can I find a cooling center? County emergency management and health department pages list current locations and hours, which typically expand during heat events.
What about leaving a child in the car for a minute? Never in these conditions. Vehicle interiors climb rapidly, and cracking a window does not prevent it.
