Right now
The most recent data we hold from NOAA arrived 22 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 21:00 UTC. It is kept here as a record.
It is the 18th strongest of the 37 detections recorded within 20 km of this point since 17 March 2026. The last comparable one was on 19 July 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 28 at 4:45PM EDT until July 28 at 5:00PM EDT by NWS Jackson KY
Urban PEI: 181,004 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- August 11, 2026 · score 43 · 8.0 km
- August 4, 2026 · score 43 · 10.5 km
- August 12, 2026 · score 43 · 18.1 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 | 36.3497, -82.1963 |
| Nearest City | Johnson City (14 km) |
| Urban exposure index (PEI) | 181.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-28T20:45:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.80444acbcad7641a46013d273274b0a8 |
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: 2026-07-28T20:45:00.000Z.
First archived: 2026-07-28T20:49:48.219Z. 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; Leslie, KY; Letcher, KY; Perry, KY; Greene, TN; Hawkins, TN; Sullivan, TN; Washington, TN; Ashe, NC; Watauga, NC; Wilkes, NC; Grayson, VA; Smyth, VA and 3 more areas |
| Headline | Severe Thunderstorm Warning issued July 28 at 4:45PM EDT until July 28 at 5:00PM EDT by NWS Jackson KY |
| Expires | 2026-07-28T17:00:00-04:00 |
| SenderName | NWS Jackson KY |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["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"] |
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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