Right now
The most recent data we hold from NOAA arrived 1 minute 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 4 July 2026 at 01:00 UTC. It is kept here as a record.
It is the 5th strongest of the 163 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 3 at 8:41PM EDT until July 3 at 9:00PM EDT by NWS Mount Holly NJ
Urban PEI: 1,747,968 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- July 4, 2026 · score 52 · 0.0 km
- July 4, 2026 · score 52 · 4.0 km
- June 22, 2026 · score 52 · 4.3 km
How we know
4 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 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) | 52 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 40.0545, -74.5465 |
| Nearest City | Mercerville-Hamilton Square (22 km) |
| Urban exposure index (PEI) | 1.7M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T00:41:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.91d11914d6cd86fd6480dec6f2b786ef |
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: 2026-07-04T00:41:00.000Z.
First archived: 2026-07-04T00:48:45.885Z. 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 | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Mercer, NJ; Middlesex, NJ; Monmouth, NJ; Burlington, NJ; Mercer, NJ; Monmouth, NJ; Ocean, NJ; Burlington, NJ; Camden, NJ and 1 more areas |
| Headline | Severe Thunderstorm Warning issued July 3 at 8:41PM EDT until July 3 at 9:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-03T21:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.91d11914d6cd86fd6480dec6f2b786efbe5b940b.002.1","noaa_urn:oid:2.49.0.1.840.0.a7a8d89b8823f0070ce510e8ae7703f79413c5bb.002.1","noaa_urn:oid:2.49.0.1.840.0.cb7d1c80f27a49d41ef40c477dbd664ec01f8c9a.002.1","noaa_urn:oid:2.49.0.1.840.0.53ac0dc68c1c0d795bd5e24779217451e75fba19.001.1"] |
| Iem TypeSummary | D |
| Iem City | Cinnaminson |
| Iem County | Burlington |
| Iem State | NJ |
| Iem Wfo | PHI |
| Iem Remark | Several wires down around Cinnaminson. Time estimated from radar. |
| MergedSources | [{"id":"iem_D_40.680_-74.640_1783121640000","source":"iem","severity":"low","severityValue":25,"timestamp":1783121640000,"latitude":40.68,"longitude":-74.64},{"id":"iem_D_40.620_-74.770_1783121760000","source":"iem","severity":"low","severityValue":25,"timestamp":1783121760000,"latitude":40.62,"longitude":-74.77},{"id":"iem_D_40.000_-74.990_1783124640000","source":"iem","severity":"low","severityValue":25,"timestamp":1783124640000,"latitude":40,"longitude":-74.99}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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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