While sweltering heat isn't unusual during the summer months across the South, record highs are in the forecast for many. The question is, why are we seeing these steamy afternoons? The WeatherRadar tells the story.

The South's ongoing heat wave is being driven by a strong area of high pressure. Sinking air beneath the high keeps skies mostly clear, allowing temperatures to soar. You can even see this heat-producing weather pattern on the WeatherRadar, where the lack of widespread clouds and rain marks the dome of hot, stable air.

Heat will continue building from the Middle Mississippi Valley into the Ohio and Tennessee valleys and the Mid-Atlantic through Friday. Use the TemperatureRadar to track where the hottest conditions are expected in your area.