Right now
The most recent data we hold from NOAA arrived 69 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 4 September 2026 at 05:00 UTC. It is kept here as a record.
No stronger detection stands among the 67 recorded within 20 km of this point since 11 March 2026 — 36 others scored the same. The last comparable one was on 3 September 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 3 at 11:59PM EDT until September 4 at 1:00AM EDT by NWS Mount Holly NJ
Urban PEI: 4,174,037 within a heuristic 50 km radius; not unique people.
Nearby, since 11 March 2026
- July 28, 2026 · 1.2 km
- March 17, 2026 · 3.6 km
- July 18, 2026 · 4.7 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
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 v4. 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 | 0.86/1 |
| Coordinates | 38.8817, -76.5541 |
| Nearest City | Parole (11 km) |
| Urban exposure index (PEI) | 4.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-04T03:59:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.c24c4fa393edd1df5a6db1d0074f035325388e6a.001.1 |
Physical priority index · v4 (historical). 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: 2026-09-04T03:59:00.000Z.
First archived: 2026-09-04T04:04:37.378Z. 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; Queen Anne's, MD; Talbot, MD; Anne Arundel, MD; Calvert, MD; Prince Georges, MD; District of Columbia, DC; Montgomery, MD; Prince Georges, MD; Arlington, VA; Fairfax, VA; City of Alexandria, VA |
| Headline | Severe Thunderstorm Warning issued September 3 at 11:59PM EDT until September 4 at 1:00AM EDT by NWS Mount Holly NJ |
| Expires | 2026-09-04T01:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c24c4fa393edd1df5a6db1d0074f035325388e6a.001.1","noaa_urn:oid:2.49.0.1.840.0.3837ce5664936ca5352fb8bfdca11f27a4157422.001.1","noaa_urn:oid:2.49.0.1.840.0.504c26a88fe8f73bf0e6c4f5a32ac20b118ec0d6.002.1"] |
| Google News RssFeed | weather |
| Google News SourceName | WBAL-TV |
| MergedSources | [{"id":"gnews_weather_496802_211","source":"google_news","severity":"medium","severityValue":40,"timestamp":1788489000000,"latitude":39.29,"longitude":-76.61}] |
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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