Flash Flood Warning Issued for Hunterdon, Mercer, Middlesex NJ and Bucks PA
This alert is no longer in effect.
NOAA issued it on September 2, 2026, 12 days ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
NWS Mount Holly has issued a Flash Flood Warning for portions of central and northern New Jersey and southeastern Pennsylvania until 1:15 AM EDT September 2.
This weather record, quickly
- Record type
- Flash Flood Warning
- Affected area
- Central New Jersey and Southeastern Pennsylvania
- Issued
- September 2, 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: historical. It was issued 12 days ago; use the issuing agency's live warning service for current conditions in Central New Jersey and Southeastern Pennsylvania.
Alert Details
Flash Flood Warning issued by NWS Mount Holly NJ. Effective from September 1 at 9:19 PM EDT until September 2 at 1:15 AM EDT. Severity: Severe. Urgency: Immediate. Certainty: Likely.
Affected Areas
Mercer County in central New Jersey; Southwestern Middlesex County in northern New Jersey; Southeastern Hunterdon County in northwestern New Jersey; Southeastern Bucks County in southeastern Pennsylvania. Specific locations include Trenton, Ewing, Princeton, Bristol, Hightstown, Pennington, Yardley, Newtown, Hopewell and Tullytown.
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 when safe.
Expected Conditions
Doppler radar indicated thunderstorms producing heavy rain. Between 1 and 2 inches of rain have fallen with expected rainfall rates of 1 to 2 inches in one hour. Flash flooding is ongoing or expected to begin shortly.
Timeline
Alert effective September 1 at 9:19 PM EDT and expires September 2 at 1:15 AM EDT.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Comparable nationwide notices (length or severity timing) 8
Two cross-category peer sets, both computed from Areazine's own archive: notices with a similar body length, and notices near the same severity and agency date. These are drawn from other categories, not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,179 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to September 2, 2026.
Common Questions
Questions readers often have about this NWS weather alert.