Pittsburgh is waking up Sunday around 72 degrees under mostly cloudy skies, but the weather is expected to turn markedly rougher as the day unfolds. Showers and thunderstorms are likely through the morning and afternoon, with a Flood Watch beginning at 10 a.m. and continuing through Sunday evening.
Heavy Rain Could Trigger Flash Flooding
Morning storms are expected to arrive before 11 a.m., followed by scattered showers and thunderstorms through the afternoon. The National Weather Service is forecasting a high near 80 degrees, southeast winds around 9 mph and rainfall totals between three-quarters of an inch and 1 inch, with heavier amounts possible where storms repeat.
The Flood Watch includes Allegheny County and warns that excessive runoff could flood rivers, creeks, streams and other low-lying areas. Drivers should avoid flooded roads and never attempt to cross moving or standing water, particularly during the heaviest downpours.
Damaging Winds Are Possible
Some thunderstorms could become severe, with damaging wind the main concern and isolated tornadoes also possible if enough instability develops. Storm activity is expected to diminish after sunset, though scattered showers and thunderstorms could linger into Sunday night before tapering off around midnight.
Residents should monitor updated warnings, especially if storms begin moving repeatedly over the same neighborhood. A Flood Watch means flooding is possible, not that every location will flood, but conditions can change quickly once heavy rain starts.
Calmer Weather Arrives Monday
Monday looks mostly cloudy but substantially quieter, with a high near 82 degrees and only a slight chance of rain. Tuesday should be sunny and warmer, reaching about 85 degrees, giving Pittsburgh a brief break before storm chances return.
Storm Chances Return Midweek
Showers and thunderstorms become more likely again Wednesday, when temperatures could reach 86 degrees and the rain chance rises to 60%. Thursday through Saturday stays warm in the mid-80s, with periodic thunderstorm chances keeping outdoor plans a little weather-dependent.
