Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is in it.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 21 September 2026 at 21:15 UTC. It is kept here as a record.
It is the 13th strongest of the 25 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 6 September 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 21 at 4:27PM EDT until September 21 at 5:15PM EDT by NWS Greenville-Spartanburg SC
Urban PEI: 110,150 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- August 12, 2026 · score 43 · 10.0 km
- March 16, 2026 · score 43 · 12.8 km
- July 28, 2026 · score 67 · 18.5 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.
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 | 0.80/1 |
| Coordinates | 35.7756, -82.6793 |
| Nearest City | Asheville (23 km) |
| Urban exposure index (PEI) | 110.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-21T20:27:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.60451a33b68503b5f905690ef2988161c61eed10.001.1 |
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: 2026-09-21T20:27:00.000Z.
First archived: 2026-09-21T20:30:23.824Z. 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 | Habersham, GA; Rabun, GA; Burke, NC; McDowell, NC; Dade, GA; Walker, GA and 7 more areas |
| Headline | Severe Thunderstorm Warning issued September 21 at 4:27PM EDT until September 21 at 5:15PM EDT by NWS Greenville-Spartanburg SC |
| Expires | 2026-09-21T17:15:00-04:00 |
| SenderName | NWS Greenville-Spartanburg SC |
| HasExactCoords | true |
| MergedCount | 11 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.60451a33b68503b5f905690ef2988161c61eed10.001.1","noaa_urn:oid:2.49.0.1.840.0.a4a7eae500f250264d42e7ff963b8ee5e99a8e37.001.1","noaa_urn:oid:2.49.0.1.840.0.9befe2b47ef366420d1f04c22e9dae240ca5721f.001.1","noaa_urn:oid:2.49.0.1.840.0.f973e8bfdafee722b98d8926f42a2448fbc020b4.001.1","noaa_urn:oid:2.49.0.1.840.0.dbd3804b9786d47bd69995592ccc0f76f49f7aa6.001.1","noaa_urn:oid:2.49.0.1.840.0.b55a08305b8950b3de78fc954045ca0b60aea3c7.001.1","noaa_urn:oid:2.49.0.1.840.0.34f42cb455850ab9ec904b1843319e324b5bee65.001.1","noaa_urn:oid:2.49.0.1.840.0.fd0fb87aab792cc4a894f56bcff79b1ed6165a8e.001.1","noaa_urn:oid:2.49.0.1.840.0.575dba8d1fd19b4cd422fba8d99104edfa839b49.001.1","noaa_urn:oid:2.49.0.1.840.0.b79231b53b4b99dfa5d18fff0c30c2c40a8c2b65.001.1","noaa_urn:oid:2.49.0.1.840.0.6febee3210ef623ac82c3a06805975ecb07455dd.001.1"] |
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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