For days, the deadliest heat wave in the eastern United States in over a decade punished the Northeast. Twenty-five people are suspected of having died from heat in New Jersey. Record temperatures in Washington, D.C., Boston, Philadelphia, and New York. Nearly 1.3 million customers losing power.
Now, the heat is moving.
According to the National Weather Service, as the heat dome shrinks and shifts south and west in the coming days, the Southeast — already warm from its own conditions — is absorbing the worst of what the Northeast experienced. On Sunday, July 6, 2026, and into Monday, heat index values are forecast to reach 107°F in Raleigh, North Carolina, and Savannah, Georgia, while Charleston, South Carolina, and Jacksonville, Florida, face values near 105°F.
The critical lesson from New Jersey is this: most of the 25 suspected victims were found indoors in homes without air conditioning, not outdoors at events. The heat dome's lethality is concentrated in domestic spaces — in upper-floor apartments, in households where elderly adults live alone, in communities where air conditioning is unavailable or unaffordable.
Why This Matters
New Jersey's heat death toll — 25 confirmed as of July 5, across 10 counties, mostly in central and northern portions of the state — provides a documented benchmark for what a multi-day heat dome does to an unprepared region.
"This is not a typical summer heat wave," New Jersey Department of Public Health spokesperson Dalya Ewais said. "This type of heat can quickly become life-threatening to humans and to animals of all ages."
New Jersey Health Commissioner Dr. Raynard Washington described the victims: "Unfortunately, many of these individuals were found in homes without air conditioning. A few were outside their residences, some on the street and some even in parked cars."
That is the precise scenario now facing the Southeast, where cooling center infrastructure may be less developed, where population density patterns differ, and where residents — not accustomed to the extended, multi-day Northeast heat event pattern — may underestimate how quickly the cumulative effect of two or three days without overnight relief becomes dangerous.
What We Know So Far
From the National Weather Service, NBC News, and Fox Weather as of July 5, 2026:
- 25 suspected heat-related deaths confirmed in New Jersey, the highest single-state toll nationally
- Additional deaths confirmed in Illinois (Cook County) and suspected in other states, bringing the national toll above 20 nationally
- Heat dome shifting south: Cool air from the north is pushing the heat dome south and west, providing relief to the Northeast while intensifying conditions in the Southeast
-
Sunday forecast (July 6) heat indices:
40 million people
remain under heat alerts across the East Coast, Southeast, and Southwest as of Sunday
- Raleigh, North Carolina: 107°F
- Savannah, Georgia: 107°F
- Charleston, South Carolina: 105°F
- Jacksonville, Florida: heat index values in dangerous range
- Washington, D.C./Baltimore/Philadelphia: still 100–105°F heat index Sunday before improving
- Power outages continue: 215,000 still without power in Michigan; 151,700 in Pennsylvania; 94,200 in New Jersey as of Sunday
Where the Risk Is Highest in the Southeast
The Southeast faces specific structural risk factors that the Northeast does not fully share:
Higher baseline humidity. The Southeast's coastal and inland humidity levels — higher than Mid-Atlantic conditions at baseline — amplify the heat index effect. A 98°F air temperature in coastal Georgia feels significantly more dangerous than the same temperature in drier conditions.
Less acclimation to extended high-humidity heat events. While the Southeast experiences extreme heat regularly, the specific pattern of a multi-day, no-overnight-relief event originating from a trapped heat dome is less common than isolated peak days. Residents may not recognize the cumulative danger the same way they would a familiar pattern.
Older housing stock. Parts of Savannah, Charleston, Raleigh's older neighborhoods, and Atlanta's less affluent areas include housing that was not built with modern air conditioning infrastructure, where window units are not available, or where electricity costs prevent continuous AC operation.
Limited cooling center awareness. Major cities have cooling centers, but smaller municipalities and rural areas between Raleigh and the coast may have fewer formal resources.
What Officials and Experts Say
"Extreme heat is the number one weather-related killer in America, and this is the hottest stretch we've seen in over 14 years," New Jersey Governor Mikie Sherrill said at a July 4 press conference confirming the NJ death toll.
Public health experts have consistently noted that overnight temperatures are among the most important variables in heat wave mortality. When overnight lows remain near 80°F — as they have across the affected region this week — the body never fully recovers its thermal regulation before the next day's peak temperatures arrive. That cumulative, multi-day physiological burden is what causes deaths among people who might survive a single hot day.
What the Evidence Shows — and What It Does Not
The 25 deaths in New Jersey are suspected heat-related fatalities — the official medical examiner process will take time to confirm the specific cause of death for each case. The New Jersey health department is reviewing each case individually.
The national total above 20 deaths reflects confirmed and suspected fatalities across multiple states; the final toll will be higher as states complete their reviews. Heat wave mortality is consistently underreported in initial reports, according to public health researchers.
The Southeast heat index forecast for Sunday represents the most credible current meteorological projection — but exact local conditions will vary. Readers in high-risk areas should monitor their local National Weather Service office for updated forecasts.
Who Faces the Greatest Risk?
Based on the New Jersey mortality profile and CDC heat wave risk data:
- Adults 65 and older living alone — the NJ victims ranged in age from the mid-30s to the 80s
- People in homes without air conditioning, particularly upper floors
- People with cardiovascular disease, diabetes, or kidney disease
- Unhoused individuals — particularly important in Savannah, Atlanta, Raleigh, and Charlotte
- People without transportation to access cooling centers
- People on medications that impair heat regulation (diuretics, beta-blockers, antipsychotics)
Symptoms and Warning Signs to Watch For
Heat exhaustion (requires immediate cooling and hydration):
- Heavy sweating, cold or clammy skin
- Rapid, weak pulse
- Nausea, muscle cramps, dizziness
Heat stroke (call 911 immediately):
- Body temperature above 103°F
- Hot, red, dry, or damp skin
- Rapid, strong pulse
- Confusion, slurred speech, or loss of consciousness
What You Can Do Now
- If you are in Raleigh, Savannah, Atlanta, Jacksonville, Charleston, or surrounding areas , activate heat safety plans now — before Sunday's peak.
- Know your nearest cooling center. Contact your city or county emergency management agency. Raleigh: raleighnc.gov . Savannah: savannahga.gov . Atlanta: atlantaga.gov . Jacksonville: coj.net .
- Check on elderly neighbors today — specifically those without visible air conditioning units in their windows.
- Do not assume your AC is sufficient if your home reaches 85°F or above indoors. If the interior cannot stay below 80°F, go to a cooling center.
- Never leave a child or pet in a parked car — vehicle interiors reach fatal temperatures within minutes.
Cost and Access: What Patients Should Know
All municipal cooling centers in major Southeast cities are free and open to the public. No ID or documentation is required.
Utility disconnections for non-payment are suspended during declared heat emergencies in many states. If you are in the Southeast and at risk of losing power, contact your utility immediately and ask whether an emergency heat protection moratorium is in effect.
What Happens Next
The National Weather Service expects heat conditions to improve across most of the Northeast by Sunday afternoon, but continues into Sunday and Monday for the Southeast. A new heat dome building between the Rockies and the West Coast is expected to bring dangerous temperatures to parts of the West later in the week.
MedicalDaily will update the regional death toll and cooling resource guidance as conditions evolve.
The Bottom Line
Twenty-five people died in New Jersey from the heat wave that gripped the eastern United States this week — most of them in their own homes without air conditioning. That pattern is now the warning the Southeast needs to hear before Sunday's heat arrives. The danger is not at outdoor events. It is in the homes of people who are elderly, alone, without cooling, and not yet aware that the Northeast's deadliest week in over a decade is headed their way.
