This alert expired on 30 May 2026 at 05:00 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 — 43 others scored the same. The last comparable one was on 25 May 2026. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued May 29 at 8:59PM EDT until May 30 at 1:00AM EDT by NWS Morristown TN
An estimated 286,915 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 8, 2026 · score 43 · 6.1 km
- May 25, 2026 · score 43 · 10.4 km
- August 12, 2026 · score 43 · 15.3 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 84 % 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) | 43 / 100 |
| Our confidence | 84% |
| Coordinates | 35.7160, -84.0400 |
| Nearest City | Maryville (8 km) |
| Population Exposed | 286.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-30T00:59:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.d0742aa13eed647a42aadc70e8413016fb52b078.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Blount, TN |
| Headline | Flash Flood Warning issued May 29 at 8:59PM EDT until May 30 at 1:00AM EDT by NWS Morristown TN |
| Expires | 2026-05-30T01:00:00-04:00 |
| SenderName | NWS Morristown TN |
| HasExactCoords | true |
| Iem TypeSummary | F |
| Iem City | 2 ESE Clover Hill |
| Iem County | Blount |
| Iem State | TN |
| Iem Wfo | MRX |
| Iem Remark | The right lane of US Hwy 411 South by Ridgeway Trail closed for flooding over roadway. |
| MergedSources | [{"id":"iem_F_35.700_-84.040_1780104060000","source":"iem","severity":"low","severityValue":25,"timestamp":1780104060000,"latitude":35.7,"longitude":-84.04}] |
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 Maryville?
Calamity.live data shows a weather event with CalamityScore 43/100, near Maryville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.