Right now
The most recent data we hold from NOAA arrived 6 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
2 other detections within 20 km in the last 24 hours, the nearest 17 km from here.
This alert expired on 21 September 2026 at 23:30 UTC. It is kept here as a record.
It is the 16th strongest of the 33 detections recorded within 20 km of this point since 27 May 2026. The last comparable one was on 6 September 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 21 at 6:26PM EDT until September 21 at 7:30PM EDT by NWS Raleigh NC
Urban PEI: 432,914 within a heuristic 50 km radius; not unique people.
Nearby, since 27 May 2026
- July 7, 2026 · score 48 · 9.9 km
- July 7, 2026 · score 37 · 12.3 km
- July 8, 2026 · score 48 · 13.7 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
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 v5. 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 | 0.85/1 |
| Coordinates | 36.3130, -79.2330 |
| Nearest City | Burlington (30 km) |
| Urban exposure index (PEI) | 432.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-21T22:26:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.f87f88cf9b2ca96ca8039b1576f4e048948b3a85.001.1 |
Physical priority index · v5. 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: 2026-09-21T22:26:00.000Z.
First archived: 2026-09-21T22:30:39.115Z. Material modification: 2026-09-21T22:36:21.540Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-21T22:36:21.540Z · data_change
Index 41 → 37; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Alamance, NC; Durham, NC; Orange, NC; Person, NC; Caswell, NC; Rockingham, NC; Halifax, VA; Pittsylvania, VA; City of Danville, VA |
| Headline | Severe Thunderstorm Warning issued September 21 at 6:26PM EDT until September 21 at 7:30PM EDT by NWS Raleigh NC |
| Expires | 2026-09-21T19:30:00-04:00 |
| SenderName | NWS Raleigh NC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f87f88cf9b2ca96ca8039b1576f4e048948b3a85.001.1","noaa_urn:oid:2.49.0.1.840.0.abfb73852c88ee54e52dda17244094b0f87ba3ef.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | Madison |
| Spc County | Rockingham |
| Spc State | NC |
| Spc Comments | Thunderstorm winds blew a tree down onto a home within the 200 block of Island Drive. (RNK) |
| MergedSources | [{"id":"spc_wind_36.39_-79.74_30","source":"spc","severity":"medium","severityValue":45,"timestamp":1790022600000,"latitude":36.39,"longitude":-79.74},{"id":"spc_wind_36.39_-79.98_31","source":"spc","severity":"medium","severityValue":45,"timestamp":1790023200000,"latitude":36.39,"longitude":-79.98}] |
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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