July 4 Weather Forecast As Hundreds of Records Could Fall
Summary
A strong heat dome is causing very high temperatures across the central and eastern United States during the July 4 holiday weekend. Many places could break daily heat records, with heat indexes reaching dangerous levels and little relief at night. Thunderstorms may also affect some outdoor July 4 events in the eastern half of the country.Key Facts
- A heat dome is raising temperatures 10 to 20 degrees above normal across the eastern U.S. during the holiday weekend.
- Heat index values (how hot it feels with humidity) could reach 105 to 115 degrees in parts of the mid-South, Southeast, and Mid-Atlantic.
- More than 300 temperature records may be broken this weekend, including over 100 daily high temps and 200 record warm overnight lows.
- Some cities, like Washington D.C., Boston, Newark, Philadelphia, and New York City have already tied or set heat records recently.
- Thunderstorms are expected in the afternoon and evening in many areas east of the Plains, potentially disrupting July 4 celebrations.
- The western U.S. will generally experience normal or below-average temperatures and sunny weather, except the Four Corners area which remains warm and dry.
- Cooler air is forecast to move into the eastern U.S. by Monday, providing some relief from the heat.
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