Right now
The most recent data we hold from NOAA arrived 2 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 22:00 UTC. It is kept here as a record.
It is the 168th strongest of the 249 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 21 at 5:46PM EDT until July 21 at 6:00PM EDT by NWS Mount Holly NJ
Urban PEI: 478,152 within a heuristic 50 km radius; not unique people.
Nearby, since 11 March 2026
- June 27, 2026 · score 43 · 2.1 km
- June 18, 2026 · score 48 · 3.9 km
- June 10, 2026 · score 41 · 4.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 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) | 37 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 39.4198, -75.4410 |
| Nearest City | Bridgeton (18 km) |
| Urban exposure index (PEI) | 478.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T21:46:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.5416e9a79ce0f1f52f7dc9cc3d8220f7 |
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: 2026-07-21T21:46:00.000Z.
First archived: 2026-07-21T21:52:51.082Z. 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 | Burlington, NJ; Kent, DE; Caroline, MD; Kent, MD; Queen Anne's, MD and 1 more areas |
| Headline | Severe Thunderstorm Warning issued July 21 at 5:46PM EDT until July 21 at 6:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-21T18:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5416e9a79ce0f1f52f7dc9cc3d8220f7df9d7055.002.1","noaa_urn:oid:2.49.0.1.840.0.a32e6b1ad3eef668ed03ea1650352f6dbb92343f.001.1","noaa_urn:oid:2.49.0.1.840.0.d98ea18bb532e6b872402c80a6bd27ce421e85be.002.1","noaa_urn:oid:2.49.0.1.840.0.78dfcef3a534577ce41ccfe4f444f467fed46bfe.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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