Right now
The most recent data we hold from NOAA arrived 11 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
34 other detections within 20 km in the last 24 hours, the nearest 3 km from here.
This alert expired on 18 September 2026 at 23:45 UTC. It is kept here as a record.
It is the 18th strongest of the 71 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 6 September 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 18 at 7:03PM EDT until September 18 at 7:45PM EDT by NWS Morristown TN
Urban PEI: 236,708 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- September 18, 2026 · score 37 · 2.6 km
- September 19, 2026 · score 37 · 3.7 km
- May 30, 2026 · score 43 · 6.1 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
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 v5. 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 | 0.85/1 |
| Coordinates | 36.0411, -83.4344 |
| Nearest City | Sevierville (22 km) |
| Urban exposure index (PEI) | 236.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-18T23:03:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.3be4fbe888dc9f5ef13e1bde273b274ad3d9f3f6.001.1 |
Physical priority index · v5. 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: 2026-09-18T23:03:00.000Z.
First archived: 2026-09-18T23:09:59.047Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-18T23:21:10.735Z · data_change
Index 37 → 37; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Grainger, TN; Hamblen, TN; Jefferson, TN |
| Headline | Severe Thunderstorm Warning issued September 18 at 7:03PM EDT until September 18 at 7:45PM EDT by NWS Morristown TN |
| Expires | 2026-09-18T19:45:00-04:00 |
| SenderName | NWS Morristown TN |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 2 W Cherokee |
| Spc County | Swain |
| Spc State | NC |
| Spc Comments | EM reports complete road blockage due to numerous trees down on Adams Creek Rd between Willie Springs and Eagles Nest. (GSP) |
| MergedSources | [{"id":"spc_wind_35.48_-83.35_26","source":"spc","severity":"medium","severityValue":45,"timestamp":1789766400000,"latitude":35.48,"longitude":-83.35}] |
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 near Sevierville?