Active Weather Alerts
Flash Flood Warning
Issued: 4:46 AM Aug. 17, 2026 – National Weather Service
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM EDT EARLY THIS MORNING FOR CENTRAL CHESTER, NORTHERN DELAWARE, SOUTHERN MONTGOMERY AND NORTHWESTERN PHILADELPHIA COUNTIES... At 1246 AM EDT, Doppler radar indicated heavy rain across the warned area. Between 1.5 and 2.5 inches of rain have fallen. Additional rainfall amounts up to 0.5 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by heavy rain. SOURCE...Radar. IMPACT...Flooding of small creeks and streams, urban areas, highways, streets, and underpasses as well as other drainage and low lying areas. Some locations that may experience flash flooding include... Philadelphia, West Chester, Norristown, Phoenixville, West Norriton, East Norriton, Coatesville, Westtown, Downingtown, Conshohocken, Royersford and Narberth. This includes the following highways... Interstate 476 in Pennsylvania between mile markers 7 and 19. Interstate 76 in Pennsylvania between mile markers 327 and 338. Pennsylvania Turnpike between mile markers 305 and 333. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. && FLASH FLOOD...RADAR INDICATED
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