Flash Flood Warning Issued for New Castle DE and Delaware PA
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NWS Mount Holly has issued a Flash Flood Warning for northeastern New Castle County in Delaware and southeastern Delaware County in Pennsylvania until 7:45 AM EDT.
Read this weather record in 30 seconds
- Record type
- Flash Flood Warning
- Affected area
- Northern Delaware and 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 at 3:32 AM EDT until August 23 at 7:45 AM EDT. Severity: Severe. Urgency: Immediate. Certainty: Likely.
Affected Areas
Northeastern New Castle County in northern Delaware and southeastern Delaware County in southeastern Pennsylvania. Specific locations that may experience flash flooding include Philadelphia, Wilmington, Chester, Yeadon, Carneys Point, Folcroft, Swarthmore, Penns Grove, Arden, Chester Township, Chelsea and Nether Providence Township. Affected highways include Interstate 476 in Pennsylvania between mile markers 0 and 7, Interstate 95 in Pennsylvania between mile markers 0 and 9, and Interstate 95 in Delaware between mile markers 15 and 23.
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
At 3:32 AM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Up to 1 inch of rain has fallen. The 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 3:32 AM EDT to 7:45 AM EDT on August 23, 2026. Flash flooding is ongoing or expected to begin shortly.
Original source: NOAA Official Notice ↗
Related Weather Alerts
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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 (1,449 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to August 23, 2026.
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