Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
3 other detections within 20 km in the last 24 hours, the nearest 7 km from here.
This alert expired on 21 September 2026 at 19:45 UTC. It is kept here as a record.
It is the 20th strongest of the 50 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 21 at 3:36PM EDT until September 21 at 3:45PM EDT by NWS Morristown TN
Urban PEI: 96,821 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- July 19, 2026 · score 39 · 4.5 km
- September 6, 2026 · score 32 · 12.9 km
- September 21, 2026 · score 37 · 13.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 32 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) | 32 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 36.7513, -82.0751 |
| Nearest City | Bristol (20 km) |
| Urban exposure index (PEI) | 96.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-21T19:36:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.20f3c8a9dbf7afd0f38a74a3587e1662288bb2b5.001.1 |
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: 2026-09-21T19:36:00.000Z.
First archived: 2026-09-21T19:41:28.843Z. 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 | Campbell, TN; Claiborne, TN; Buchanan, VA; Dickenson, VA; Buchanan, VA; McDowell, WV and 2 more areas |
| Headline | Severe Thunderstorm Warning issued September 21 at 3:36PM EDT until September 21 at 3:45PM EDT by NWS Morristown TN |
| Expires | 2026-09-21T15:45:00-04:00 |
| SenderName | NWS Morristown TN |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.20f3c8a9dbf7afd0f38a74a3587e1662288bb2b5.001.1","noaa_urn:oid:2.49.0.1.840.0.1d740a1bd28c6cf9d4eb13274ffed6cd759503d5.001.1","noaa_urn:oid:2.49.0.1.840.0.bca17f2d496af69c3cfcfe342464fcd920181619.001.1","noaa_urn:oid:2.49.0.1.840.0.58dc741f5e0b1a0bd080340d607db1e6eb04d3b3.001.1","noaa_urn:oid:2.49.0.1.840.0.08afa1bdaa53f2596d687445a72c8ae9e7dda048.001.1"] |
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.
Want to know when something happens near Bristol?