Friday, July 25, is shaping up to be a dangerous weather day across the Philadelphia region, as severe storms and oppressive heat converge in what’s expected to be a volatile afternoon.
The day kicked off under humid skies and bright sunshine, but by Noon, the First Alert went into effect — and it’s expected to stay active until 9 p.m. as conditions take a sharp turn.
Forecasters expect strong thunderstorms to begin developing around 4 p.m., sweeping from the northwest to the southeast. These storms could pack damaging wind gusts and cause localized flash flooding, especially in low-lying areas and urban streets of Philadelphia, Montgomery, and Delaware Counties.
Simultaneously, an excessive heat warning remains in effect, with temperatures climbing into the upper 90s Fahrenheit (around 36–37°C). The heat index, or “feels like” temperature, could reach 105°F (40.5°C) or higher — creating dangerous heat stress conditions, particularly for those without access to cooling.
Areas stretching from Center City Philadelphia out toward the Main Line, as well as South Jersey and parts of the Lehigh Valley, should all brace for tropical-level humidity, mixed with intense instability that will fuel the storm potential through the evening.
Stay alert through the afternoon and evening as weather conditions may rapidly deteriorate in neighborhoods across Southeastern Pennsylvania, South Jersey, and Northern Delaware.
