Right now
The most recent data we hold from NOAA arrived 1 minute 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 22 May 2026 at 23:30 UTC. It is kept here as a record.
It is the 6th strongest of the 22 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 22 at 7:11PM EDT until May 22 at 7:30PM EDT by NWS Morristown TN
Urban PEI: 29,478 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- May 22, 2026 · score 43 · 12.7 km
- July 22, 2026 · score 34 · 16.9 km
- July 22, 2026 · score 43 · 18.2 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 34 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) | 34 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 36.3891, -83.5836 |
| Nearest City | Morristown (33 km) |
| Urban exposure index (PEI) | 29.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-22T23:11:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.6707d4398f605ea79b671b1cee2b7bcf25ff7948.002.1 |
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: 2026-05-22T23:11:00.000Z.
First archived: 2026-05-22T23:28:06.997Z. 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 | Claiborne, TN; Grainger, TN; Hancock, TN |
| Headline | Severe Thunderstorm Warning issued May 22 at 7:11PM EDT until May 22 at 7:30PM EDT by NWS Morristown TN |
| Expires | 2026-05-22T19:30:00-04:00 |
| SenderName | NWS Morristown TN |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 2 S Rose Hill |
| Iem County | Union |
| Iem State | TN |
| Iem Wfo | MRX |
| Iem Remark | Several trees down. |
| MergedSources | [{"id":"iem_D_36.320_-83.720_1779490800000","source":"iem","severity":"low","severityValue":25,"timestamp":1779490800000,"latitude":36.32,"longitude":-83.72},{"id":"iem_D_36.280_-83.770_1779489600000","source":"iem","severity":"low","severityValue":25,"timestamp":1779489600000,"latitude":36.28,"longitude":-83.77}] |
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 in this area?