A strong subsidence pattern is currently affecting the Valley, causing temperatures to rise sharply. This pattern involves large-scale sinking air that warms as it compresses, resulting in extremely hot conditions. As a result, heat index values are expected to climb significantly.

Forecasters predict that the heat index will approach the 120-degree mark on Thursday. Further details on the forecast are available from ValleyCentral, including specific forecast highs for the area. Readers can visit the source for more information on the expected heat and its impact on the Valley.