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.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 28 July 2026 at 21:45 UTC. It is kept here as a record.
It is the 4th strongest of the 34 detections recorded within 20 km of this point since 16 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 July 28 at 5:13PM EDT until July 28 at 5:45PM EDT by NWS Morristown TN
Urban PEI: 61,963 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- September 5, 2026 · score 32 · 4.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 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) | 39 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 36.3496, -81.7775 |
| Nearest City | Boone (17 km) |
| Urban exposure index (PEI) | 62.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-28T21:13:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.51d77865bf855832132635f5d5e03a99 |
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: 2026-07-28T21:13:00.000Z.
First archived: 2026-07-28T21:15:21.792Z. 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 | Greene, TN; Unicoi, TN; Harlan, KY; Carter, TN; Unicoi, TN; Washington, TN and 9 more areas |
| Headline | Severe Thunderstorm Warning issued July 28 at 5:13PM EDT until July 28 at 5:45PM EDT by NWS Morristown TN |
| Expires | 2026-07-28T17:45:00-04:00 |
| SenderName | NWS Morristown TN |
| HasExactCoords | true |
| MergedCount | 12 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.51d77865bf855832132635f5d5e03a994e95f037.001.1","noaa_urn:oid:2.49.0.1.840.0.65fe3923d0df417186225da0d4faa67c5bd06ea8.001.1","noaa_urn:oid:2.49.0.1.840.0.27b2024e22f54dd03b383282997d0446ec130da8.001.1","noaa_urn:oid:2.49.0.1.840.0.67d9057ee786d672e8f947618fdda434dc01f374.001.1","noaa_urn:oid:2.49.0.1.840.0.a1ac944e401ab87e7337073ba0507efbc4abda60.002.1","noaa_urn:oid:2.49.0.1.840.0.cfc49a91ef3fd78fb844a7e73cde714c0a50897d.002.1","noaa_urn:oid:2.49.0.1.840.0.a299986584f57adbeb7d6032c3d5fdc7473855ca.001.1","noaa_urn:oid:2.49.0.1.840.0.237d91850192479d8eac29af3c0e1faa5e4bc437.001.1","noaa_urn:oid:2.49.0.1.840.0.491cbcaaaeacbf425b8dcf44d1ac37382ffebd9e.001.1","noaa_urn:oid:2.49.0.1.840.0.0894c39ad0c343e32b079a68a1d058519ca79222.001.1","noaa_urn:oid:2.49.0.1.840.0.9779e3ff8094f083d042d15d8a9d459ec1bb748a.001.1","noaa_urn:oid:2.49.0.1.840.0.6e0bd21b671a449c26e82e8d3af7016387ee3b7e.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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