Right now
The most recent data we hold from NOAA arrived 3 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 21:30 UTC. It is kept here as a record.
It is the 17th strongest of the 35 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 28 at 4:53PM EDT until July 28 at 5:30PM EDT by NWS Jackson KY
Urban PEI: 162,848 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- August 11, 2026 · score 43 · 4.8 km
- August 4, 2026 · score 43 · 7.0 km
- August 13, 2026 · score 43 · 15.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 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) | 37 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 36.3414, -82.2352 |
| Nearest City | Johnson City (11 km) |
| Urban exposure index (PEI) | 162.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-28T20:53:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.5d82e3272c93091f7b75a826f58bc597 |
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: 2026-07-28T20:53:00.000Z.
First archived: 2026-07-28T20:54:53.944Z. 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 | Harlan, KY; Greene, TN; Harlan, KY; Leslie, KY; Letcher, KY; Perry, KY and 6 more areas |
| Headline | Severe Thunderstorm Warning issued July 28 at 4:53PM EDT until July 28 at 5:30PM EDT by NWS Jackson KY |
| Expires | 2026-07-28T17:30:00-04:00 |
| SenderName | NWS Jackson KY |
| HasExactCoords | true |
| MergedCount | 9 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5d82e3272c93091f7b75a826f58bc59791fd604c.001.1","noaa_urn:oid:2.49.0.1.840.0.491cbcaaaeacbf425b8dcf44d1ac37382ffebd9e.001.1","noaa_urn:oid:2.49.0.1.840.0.80444acbcad7641a46013d273274b0a87bacbec8.001.1","noaa_urn:oid:2.49.0.1.840.0.0894c39ad0c343e32b079a68a1d058519ca79222.001.1","noaa_urn:oid:2.49.0.1.840.0.1ac963c20780ab0fc1d37e7461cfde3339329cc3.001.1","noaa_urn:oid:2.49.0.1.840.0.3c1476b51a793fb889cb227ace341ee217cc7dae.002.1","noaa_urn:oid:2.49.0.1.840.0.9779e3ff8094f083d042d15d8a9d459ec1bb748a.001.1","noaa_urn:oid:2.49.0.1.840.0.3922f7a24ee69fbbb95d114991c4f67361f0819e.001.1","noaa_urn:oid:2.49.0.1.840.0.7f40addd9931dd806ca310e93f017271aa05d02d.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 Johnson City?