美国国家气象局匹兹堡分局于9月12日东部夏令时下午5:34发布山洪预警,有效期至9月12日东部夏令时晚上8:00。
下午5点34分（美国东部夏令时），当地执法部门报告称预警区域内出现山洪暴发。降雨量已达1.5至2.5英寸。预计还将出现0.5至1英寸的额外降雨……
At 534 PM EDT, local law enforcement reported flash flooding across the warned area. Between 1.5 and 2.5 inches of rain have fallen. Additional rainfall amounts of 0.5 to 1 inch are possible in the warned area. Flash flooding is already occurring.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Law enforcement reported.
IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas.
Some locations that will experience flash flooding include... Indiana, Rural Valley, West Lebanon, Dayton, Chevy Chase Heights, Rossiter, Ernest, Marion Center, Elderton, Creekside, Plumville, Shelocta, Atwood, Dixonville, Jacksonville, Smicksburg and Rochester Mills.
Affected area: Armstrong, PA; Indiana, PA