This alert expired on 30 May 2026 at 14:00 UTC. It is kept here as a record.
It is the 33rd strongest of the 68 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 15 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued May 30 at 8:11AM EDT until May 30 at 10:00AM EDT by NWS Morristown TN
An estimated 286,915 people live within 50 km of this point.
Nearby, since 16 March 2026
- June 8, 2026 · score 43 · 6.7 km
- July 13, 2026 · score 43 · 9.4 km
- May 30, 2026 · score 37 · 9.4 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, at 81 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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 |
| Our confidence | 81% |
| Coordinates | 35.9477, -83.9888 |
| Nearest City | Knoxville (6 km) |
| Population Exposed | 286.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-30T12:11:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.7494dd5e06cbcb8fab0627422893fbe0 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Anderson, TN; Morgan, TN; Greene, TN; McMinn, TN and 1 more areas |
| Headline | Flash Flood Warning issued May 30 at 8:11AM EDT until May 30 at 10:00AM EDT by NWS Morristown TN |
| Expires | 2026-05-30T10:00:00-04:00 |
| SenderName | NWS Morristown TN |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7494dd5e06cbcb8fab0627422893fbe0d1584e87.001.1","noaa_urn:oid:2.49.0.1.840.0.090357cab7eb615e66323166b9a75a7625d7e3e3.001.1","noaa_urn:oid:2.49.0.1.840.0.cbb34a70da51c954ba82ab6807b7572600050078.001.1","noaa_urn:oid:2.49.0.1.840.0.2a2b12381b761c9d48d523e1464d29b48b87c836.001.1"] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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.
Want to know when something happens near Knoxville?
Calamity.live data shows a weather event with CalamityScore 37/100, near Knoxville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.