Right now
The most recent data we hold from NOAA arrived 6 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
This alert expired on 21 September 2026 at 20:46 UTC. It is kept here as a record.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 21 at 4:37PM EDT until September 21 at 4:45PM EDT by NWS Greenville-Spartanburg SC
Urban PEI: 133,514 within a heuristic 50 km radius; not unique people.
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 | 33.9795, -86.4104 |
| Nearest City | Dixiana (35 km) |
| Urban exposure index (PEI) | 133.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-21T20:37:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.623a54eef4149fc1d21874c6514f8e3facdc0429.001.1 |
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: 2026-09-21T20:37:00.000Z.
First archived: 2026-09-21T20:41:15.127Z. 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 | Henderson, NC; Habersham, GA; Rabun, GA; Dade, GA; Walker, GA and 4 more areas |
| Headline | Severe Thunderstorm Warning issued September 21 at 4:37PM EDT until September 21 at 4:45PM EDT by NWS Greenville-Spartanburg SC |
| Expires | 2026-09-21T16:46:00-04:00 |
| SenderName | NWS Greenville-Spartanburg SC |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.623a54eef4149fc1d21874c6514f8e3facdc0429.001.1","noaa_urn:oid:2.49.0.1.840.0.b8018fdf02569d827c9eca6906db1c275fe60376.001.1","noaa_urn:oid:2.49.0.1.840.0.1649a06438ba126f350bff7118de460b482c7d13.001.1","noaa_urn:oid:2.49.0.1.840.0.575dba8d1fd19b4cd422fba8d99104edfa839b49.001.1","noaa_urn:oid:2.49.0.1.840.0.5b5036ca6bab3bc0e6c4afe28bdc3029eb4b5d92.001.1","noaa_urn:oid:2.49.0.1.840.0.1960cc2ebc03ec28140b0ec4780f39e614cc61ba.001.1","noaa_urn:oid:2.49.0.1.840.0.54036f79b9f2b15449c3589a63bf8e51f9043521.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | Birmingham |
| Spc County | Jefferson |
| Spc State | AL |
| Spc Comments | A few trees and tree limbs down in the Birmingham area. (BMX) |
| MergedSources | [{"id":"spc_wind_33.52_-86.80_5","source":"spc","severity":"medium","severityValue":45,"timestamp":1790014500000,"latitude":33.52,"longitude":-86.8}] |
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.
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