Flash Flood Warning Issued for Southeastern Pennsylvania Counties
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NWS Mount Holly has issued a Flash Flood Warning for Bucks, Chester, Delaware, Montgomery, and Philadelphia counties in Pennsylvania until 8:00 AM EDT.
Read this weather record in 30 seconds
- Record type
- Flash Flood Warning
- Affected area
- Southeastern Pennsylvania
- Issued
- August 23, 2026
- Issuing authority
- NWS Mount Holly NJ
Flood notices turn on location and timing. Treat the named area as this record's scope; do not assume nearby counties, parishes, or waterways were included.
Record status: publication date is recent, but current status is not stored on this page. Check the issuing agency's live warning service before acting because warnings can be updated, narrowed, or cancelled.
Alert Details
Flash Flood Warning issued by NWS Mount Holly NJ. Effective from August 23, 2026 at 3:49 AM EDT until August 23, 2026 at 8:00 AM EDT. Severity: Severe. Urgency: Immediate. Certainty: Likely.
Affected Areas
South Central Bucks County, Eastern Chester County, Northeastern Delaware County, Southeastern Montgomery County, and Philadelphia County in southeastern Pennsylvania. Specific locations that may experience flash flooding include Philadelphia, Bensalem, Norristown, Lansdale, West Norriton, East Norriton, Yeadon, Conshohocken, Hatboro and Ambler. Affected highways include Interstate 476 (mile markers 7-19), Interstate 76 (mile markers 327-351), Interstate 95 (mile markers 14-37), Interstate 676 (mile markers 0-1), Northeast Extension (mile markers 21-25), and Pennsylvania Turnpike (mile markers 326-348).
What You Should Do
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. Report observed flooding to local emergency services or law enforcement.
Expected Conditions
Doppler radar indicated thunderstorms producing heavy rain. Between 1 and 1.5 inches of rain have fallen. Expected rainfall rate is 1 to 2 inches in 1 hour. Additional rainfall amounts up to 1 inch are possible.
Timeline
The warning is in effect from 3:49 AM EDT until 8:00 AM EDT on August 23, 2026.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,445 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to August 23, 2026.
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