Severe · Flash Flood WarningActive alert
Flash Flood Warning issued September 3 at 8:32PM EDT until September 4
Affecting Allegheny, PA; Armstrong, PA; Indiana, PA; Westmoreland, PA
In effect until: Sep 4, 2026, 4:45 AM
Allegheny, PA; Armstrong, PA; Indiana, PA; Westmoreland, PA
Likely impact across 4 counties in PA; effects through 4:45 AM.
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding.
Read the original bulletin (official text)
FFWPBZ The National Weather Service in Pittsburgh has extended the * Flash Flood Warning for... Southeastern Allegheny County in southwestern Pennsylvania... Western Westmoreland County in southwestern Pennsylvania... Southwestern Armstrong County in west central Pennsylvania... Southwestern Indiana County in west central Pennsylvania... * Until 1245 AM EDT. * At 832 PM EDT, local law enforcement reported thunderstorms producing heavy rain across the warned area. Between 1.5 and 3.5 inches of rain have fallen. Additional rainfall amounts of 0.5 to 1 inch are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Law enforcement reported. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. * Some locations that will experience flash flooding include... Monroeville, Greensburg, Jeannette, Vandergrift, Apollo, Murrysville, White Oak, Irwin, Manor, Trafford, Youngwood, Delmont, West Newton, New Stanton, Leechburg, North Apollo, West Leechburg and Avonmore. Water rescues were reported in Penn Township. Additional heavy rain will continue across portions of the area this evening.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™