This alert expired on 27 August 2026 at 23:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 268 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flood Warning issued August 27 at 3:26PM EDT until August 27 at 7:15PM EDT by NWS Mount Holly NJ
An estimated 3,364,019 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 21, 2026 · score 46 · 4.0 km
- July 28, 2026 · score 76 · 5.8 km
- June 15, 2026 · score 52 · 6.3 km
How we know
Confirmed by 61 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 90 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 90% |
| Coordinates | 39.8200, -75.4950 |
| Nearest City | Wilmington (9 km) |
| Population Exposed | 3.4M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-27T19:26:00.000Z |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | New Castle, DE; Gloucester, NJ; Salem, NJ; Delaware, PA |
| Headline | Flood Warning issued August 27 at 3:26PM EDT until August 27 at 7:15PM EDT by NWS Mount Holly NJ |
| Expires | 2026-08-27T19:15:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 1 S Upper Oxford Twp |
| Spc County | Chester |
| Spc State | PA |
| Spc Comments | Tree damage between Oxford and Russellville. Time estimated from radar. (PHI) |
| Iem TypeSummary | R |
| Iem Magnitude | 2.13 |
| Iem Unit | Inch |
| Iem City | 2 S Pine Valley |
| Iem County | Camden |
| Iem State | NJ |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
Series begins 10 February 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Calamity.live data shows a weather event with CalamityScore 52/100, near Wilmington (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.