A widespread heat wave is forecast to affect much of the central and eastern United States over the Fourth of July weekend, driven by a strong “heat dome”, a high pressure system sitting over the US, bringing moisture and warm air from the Gulf of Mexico (Al Jazeera, 2026).
Daytime high temperatures are expected to be over 100°F (32–38°C+), with heat index values reaching 105–115°F (41–46°C) in some areas because of high humidity (CBS News, 2026). While the heat index, which combines temperature and humidity, is commonly used in US weather forecasts, another measure for humid heat extremes especially designed to measure the impact of humid heat during physical activity is the Wet Bulb Globe Temperature (WBGT)…
Source: World Weather Attribution
World Weather Attribution
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