Right now
The most recent data we hold from NOAA arrived 3 hours 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 12 June 2026 at 01:45 UTC. It is kept here as a record.
It is the 77th strongest of the 151 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 11 at 9:12PM EDT until June 11 at 9:45PM EDT by NWS Mount Holly NJ
Urban PEI: 1,018,787 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- July 22, 2026 · score 52 · 2.3 km
- July 27, 2026 · score 52 · 2.8 km
- March 17, 2026 · score 52 · 6.1 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 | 0.80/1 |
| Coordinates | 38.5688, -76.6355 |
| Nearest City | St. Charles (25 km) |
| Urban exposure index (PEI) | 1.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-12T01:12:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.39958b307014927b53eef518d5644cc7 |
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: 2026-06-12T01:12:00.000Z.
First archived: 2026-06-12T01:21:12.674Z. 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 | Caroline, MD; Kent, MD; Queen Anne's, MD; Talbot, MD; Anne Arundel, MD; Baltimore, MD; Calvert, MD; Cecil, MD; Charles, MD; Harford, MD; Prince Georges, MD; St. Marys, MD; Baltimore City, MD; King George, VA; Stafford, VA; City of Fredericksburg, VA; Spotsylvania, VA; Stafford, VA; City of Fredericksburg, VA and 1 more areas |
| Headline | Severe Thunderstorm Warning issued June 11 at 9:12PM EDT until June 11 at 9:45PM EDT by NWS Mount Holly NJ |
| Expires | 2026-06-11T21:45:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.39958b307014927b53eef518d5644cc78e2a19e7.001.1","noaa_urn:oid:2.49.0.1.840.0.888c81c2f40ac8cfd916817ac63785efa1b65b0f.002.1","noaa_urn:oid:2.49.0.1.840.0.785430f57f535b0ce9f3333389ad76460270855b.002.1","noaa_urn:oid:2.49.0.1.840.0.a61fcb5bc26bdaf273e0383f4f7470bc8b487f47.001.1"] |
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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