Right now
The most recent data we hold from NOAA arrived 50 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 20 May 2026 at 23:30 UTC. It is kept here as a record.
No stronger detection stands among the 56 recorded within 20 km of this point since 16 March 2026 — 26 others scored the same. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 20 at 7:14PM EDT until May 20 at 7:30PM EDT by NWS Morristown TN
Urban PEI: 286,915 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- July 12, 2026 · score 43 · 4.5 km
- March 16, 2026 · score 43 · 10.7 km
- June 9, 2026 · score 37 · 11.2 km
How we know
7 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 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) | 43 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 36.0533, -83.8233 |
| Nearest City | Knoxville (14 km) |
| Urban exposure index (PEI) | 286.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T23:14:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7827a492c48d73cfbfe82a6a92b3745d2cef2ba0.001.1 |
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: 2026-05-20T23:14:00.000Z.
First archived: 2026-05-20T23:27:08.504Z. 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 | Anderson, TN; Knox, TN |
| Headline | Severe Thunderstorm Warning issued May 20 at 7:14PM EDT until May 20 at 7:30PM EDT by NWS Morristown TN |
| Expires | 2026-05-20T19:30:00-04:00 |
| SenderName | NWS Morristown TN |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 2 SW Maloneyville |
| Iem County | Knox |
| Iem State | TN |
| Iem Wfo | MRX |
| Iem Remark | Tree partially blocking the east bound lanes. |
| MergedSources | [{"id":"iem_D_35.890_-83.940_1779318120000","source":"iem","severity":"low","severityValue":25,"timestamp":1779318120000,"latitude":35.89,"longitude":-83.94},{"id":"iem_D_36.000_-83.770_1779317460000","source":"iem","severity":"low","severityValue":25,"timestamp":1779317460000,"latitude":36,"longitude":-83.77},{"id":"iem_D_35.880_-83.920_1779317700000","source":"iem","severity":"low","severityValue":25,"timestamp":1779317700000,"latitude":35.88,"longitude":-83.92},{"id":"iem_D_35.950_-83.920_1779317160000","source":"iem","severity":"low","severityValue":25,"timestamp":1779317160000,"latitude":35.95,"longitude":-83.92},{"id":"iem_D_35.950_-83.920_1779318480000","source":"iem","severity":"low","severityValue":25,"timestamp":1779318480000,"latitude":35.95,"longitude":-83.92},{"id":"iem_D_36.060_-83.860_1779317220000","source":"iem","severity":"low","severityValue":25,"timestamp":1779317220000,"latitude":36.06,"longitude":-83.86}] |
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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