Right now
The most recent data we hold from NOAA arrived 9 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 10 July 2026 at 00:30 UTC. It is kept here as a record.
It is the 17th strongest of the 80 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 6 July 2026. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 9 at 6:19PM EDT until July 9 at 8:30PM EDT by NWS Mount Holly NJ
Urban PEI: 382,254 within a heuristic 50 km radius; not unique people.
Nearby, since 11 March 2026
- March 12, 2026 · score 43 · 1.8 km
- August 8, 2026 · score 37 · 10.8 km
- July 9, 2026 · score 43 · 13.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 43 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 39.5888, -75.9245 |
| Nearest City | Elkton (8 km) |
| Urban exposure index (PEI) | 382.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-09T22:19:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.33d3bd27053bff2717adb4826d64d175 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-07-09T22:19:00.000Z.
First archived: 2026-07-09T23:31:45.529Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Burlington, NJ; Camden, NJ; Gloucester, NJ; Lancaster, PA; York, PA; New Castle, DE; Chester, PA; Delaware, PA and 3 more areas |
| Headline | Flash Flood Warning issued July 9 at 6:19PM EDT until July 9 at 8:30PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-09T20:30:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.33d3bd27053bff2717adb4826d64d1752587530e.001.1","noaa_urn:oid:2.49.0.1.840.0.87d592679b005a4aa4448de75e73af2874e3cd49.001.1","noaa_urn:oid:2.49.0.1.840.0.4d81679a14d021484d29fe9903a76005cd7130db.001.1","noaa_urn:oid:2.49.0.1.840.0.4e39fcbc2f53e223ecd421e936c4f656abd95556.001.1","noaa_urn:oid:2.49.0.1.840.0.ae425d1b36d29dbd19308583aa59959d44e4166d.001.1","noaa_urn:oid:2.49.0.1.840.0.979cc79ecc8428eb4375109429895098b4e33097.001.1"] |
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 8 March 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.
Review the area, threshold and delivery channel in your account.
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