Right now
The most recent data we hold from NOAA arrived 5 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 9 July 2026 at 21:45 UTC. It is kept here as a record.
It is the 14th strongest of the 83 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 6 July 2026. 12 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 9 at 2:07PM EDT until July 9 at 5:45PM EDT by NWS Mount Holly NJ
Urban PEI: 435,183 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- July 9, 2026 · score 43 · 1.9 km
- August 10, 2026 · score 43 · 6.7 km
- August 7, 2026 · score 37 · 8.3 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 | 0.81/1 |
| Coordinates | 39.8793, -76.6514 |
| Nearest City | York (11 km) |
| Urban exposure index (PEI) | 435.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-09T18:07:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.569cab232fcdeba90917c8bc7ed2d890 |
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: 2026-07-09T18:07:00.000Z.
First archived: 2026-07-09T18:14:42.946Z. 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 | New Castle, DE; Gloucester, NJ; Salem, NJ; Delaware, PA; Adams, PA; Lancaster, PA; York, PA; Frederick, MD and 5 more areas |
| Headline | Flash Flood Warning issued July 9 at 2:07PM EDT until July 9 at 5:45PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-09T17:45:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.569cab232fcdeba90917c8bc7ed2d890b2794781.001.1","noaa_urn:oid:2.49.0.1.840.0.2dc7483075e1f847fbd98dcd35fa9e0167a9be74.001.1","noaa_urn:oid:2.49.0.1.840.0.529c42cfa47685ae827fb221073d89967c3880b4.001.1","noaa_urn:oid:2.49.0.1.840.0.814ae5ed8872e8084d27a5a2066d468c4ff2e7c7.001.1","noaa_urn:oid:2.49.0.1.840.0.6ca45032e585cc4faea6c40b32e288ab31711fc0.001.1","noaa_urn:oid:2.49.0.1.840.0.7d5e5c4840e783b074e6bebdf79e70c2195d3d1d.001.1","noaa_urn:oid:2.49.0.1.840.0.6ed9bef4e9d60f18d2ec4d7dc8e176d37ac52ab6.001.1","noaa_urn:oid:2.49.0.1.840.0.c542b071c386172fc75aab4f230fc6fd8e267696.001.1"] |
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.
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