Flood Warning — Chester County, Pennsylvania
Flooding is occurring or imminent along rivers, streams, or low-lying areas.
Current Status
🌊 Active: Flood Warning
Flood Warning issued August 27 at 9:09PM EDT until August 28 at 1:15AM EDT by NWS Mount Holly NJ
* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...South Central Bucks County in southeastern Pennsylvania... Northern Chester County in southeastern Pennsylvania... Central Montgomery County in southeastern Pennsylvania... * WHEN...Until 115 AM EDT. * IMPACTS...Flooding of rivers, creeks, streams, and other low-lying and flood-prone locations is imminent or occurring. * ADDITIONAL DETAILS... - At 907 PM EDT, Doppler radar indicated heavy rain due to thunderstorms. Flooding is ongoing or expected to begin shortly in the warned area. Between 3 and 4 inches of rain have fallen. - Additional rainfall amounts up to 0.5 inches are possible in the warned area. - Some locations that will experience flooding include... Norristown, Phoenixville, Lansdale, West Norriton, East Norriton, Coatesville, Downingtown, Hatboro, Ambler, Collegeville, Royersford and Parkesburg. - http://www.weather.gov/safety/flood
Effective August 27, 2026 at 9:09 PM ET · Expires August 28, 2026 at 1:15 AM ET
Event Details
Event Type
Flood Warning
Severity
severe
Issued By
NWS Mount Holly NJ
Expires
August 28, 2026 at 1:15 AM ET
Last Checked
2 minutes ago
What To Do
📋 Official NWS Guidance
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.
Other Active Alerts in Pennsylvania
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Get Flood Warning Alerts for Chester County
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Frequently Asked Questions
What does a Flood Warning mean for Chester County, Pennsylvania?
Flooding is occurring or imminent along rivers, streams, or low-lying areas.
Is this Flood Warning currently active?
Yes — this alert is active as of our last check (2 minutes ago). It's set to expire August 28, 2026 at 1:15 AM ET.
How do I get notified about Flood Warning alerts for Chester County?
Download StormCast free on Google Play and set Chester County, Pennsylvania as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.