July 4 Heat Dome: Map Shows States Facing Dangerous Temperatures
Summary
A heat dome will cause very hot weather across much of the central and eastern United States from July 2 to 6, including the July 4 holiday weekend. The National Weather Service warns that extreme heat conditions could affect millions of people and pose health risks during outdoor celebrations.Key Facts
- More than 30 states in the central and eastern U.S. are expected to experience hotter-than-normal temperatures.
- Temperatures may reach the high 90s to low 100s in states like Minnesota, Illinois, Ohio, Kentucky, Tennessee, and many others.
- Nighttime temperatures will stay warm, only dropping to the mid-70s, reducing relief from daytime heat.
- The heat dome is caused by a strong high-pressure system trapping hot air and limiting clouds and rain.
- The Climate Prediction Center has issued high risk of extreme heat for parts of the eastern Great Plains, Mississippi, Ohio, Tennessee valleys, Appalachians, Southeast, and Mid-Atlantic.
- Heat index values, which measure how hot it feels when humidity is included, could rise above 100 to 105 degrees.
- The ridge of high pressure is expected to move west after July 4, easing heat on the East Coast but increasing heat risks in the interior West.
- July 4 marks the 250th anniversary of the United States with many outdoor events planned, increasing concern about heat exposure.
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