Isolated Thunderstorms and Flash Flood Risk in Pittsburgh Area
The Pittsburgh area is under a First Alert Weather Day on Sunday, September 13, 2026, with isolated thunderstorms expected in the evening. The day will start with decreasing clouds and patchy fog, followed by sunshine and highs in the low 80s°F (approximately 27°C). While most of the day will remain dry, isolated areas may experience quick downpours, which could lead to flash flooding due to saturated ground from previous rainfall. The region is under a marginal risk (1 out of 5) for severe weather, with the highest likelihood of storms occurring north of Pittsburgh during outdoor events in the evening.