Right now
The most recent data we hold from NOAA arrived 27 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 21 July 2026 at 21:45 UTC. It is kept here as a record.
It is the 143rd strongest of the 394 detections recorded within 20 km of this point since 12 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 21 at 4:50PM EDT until July 21 at 5:45PM EDT by NWS Mount Holly NJ
Urban PEI: 2,522,813 within a heuristic 50 km radius; not unique people.
Nearby, since 12 March 2026
- August 5, 2026 · score 46 · 5.8 km
- July 9, 2026 · score 52 · 7.3 km
- September 2, 2026 · score 46 · 8.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 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) | 46 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 39.6635, -75.5839 |
| Nearest City | Bear (8 km) |
| Urban exposure index (PEI) | 2.5M within 50 km |
| Impact Tier | significant |
| Date | 2026-07-21 — time not reported by the source |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.f2d5adf631edd053e3b942f8f13266ee |
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: 2026-07-21 — time not reported.
First archived: 2026-07-21T20:51:29.649Z. 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; Somerset, NJ; Fairfield, CT; Nassau, NY; Suffolk, NY; Delaware, PA; Montgomery, PA; Philadelphia, PA and 5 more areas |
| Headline | Severe Thunderstorm Warning issued July 21 at 4:50PM EDT until July 21 at 5:45PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-21T17:45:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f2d5adf631edd053e3b942f8f13266eeb46f038a.001.1","noaa_urn:oid:2.49.0.1.840.0.615c2b1e83dde886b6575b9ca773acce905e2c1c.002.1","noaa_urn:oid:2.49.0.1.840.0.569fd7ad5c705c2a096bc7de34dc41860eb4aa77.002.1","noaa_urn:oid:2.49.0.1.840.0.4fc57b2e9eab7dc421b3368b8b18610b9d78dcc2.001.1","noaa_urn:oid:2.49.0.1.840.0.9559ba3918892896bba700fcd29e3a3e40ae9a27.001.1","noaa_urn:oid:2.49.0.1.840.0.4c5583b9f02401ee9e1e43c217fa89acca5b70c2.001.1","noaa_urn:oid:2.49.0.1.840.0.866932b8b2cb50c26d078e18f304f5be90719c17.001.1","noaa_urn:oid:2.49.0.1.840.0.a496c7d6821e4affb467f50f6ed8956ef7fa6291.001.1"] |
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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