Map Shows Where Record-Breaking Heat Dome Could Impact Millions on July 4
Summary
A large and intense heat dome is expected to bring extremely high temperatures and humidity across much of the central and eastern United States during the week of July 4. This extreme heat could affect millions of people, with some areas facing record-breaking temperatures and dangerous conditions that strain health and infrastructure.Key Facts
- The heat dome will peak from Tuesday through Thursday across the Midwest and Mississippi Valley, then spread to the Ohio Valley and East Coast later in the week.
- Temperatures could reach the 90s to low 100s (°F), with humidity making it feel like 100 to 115 degrees.
- The National Weather Service uses a HeatRisk scale from Level 0 to Level 4; Level 4 means rare, extreme heat that can affect anyone without proper cooling or water.
- Level 4 heat risk is expected from Thursday through Saturday in many states including Michigan, Illinois, Pennsylvania, New York, and Virginia.
- Many locations in the Northeast and Midwest are predicted to break temperature records during this period.
- The heat dome causes heat by trapping hot air and blocking clouds, which increases sunshine and boosts temperatures.
- Extreme heat may continue into the next week with some relief possible by July 7.
- The heat dome is different from a normal heat wave because it lasts longer and prevents cloud formation, creating more intense heat.
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