Right now
The most recent data we hold from NOAA arrived 3 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 27 June 2026 at 22:15 UTC. It is kept here as a record.
It is the 2nd strongest of the 52 detections recorded within 20 km of this point since 26 May 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 27 at 5:19PM EDT until June 27 at 6:15PM EDT by NWS Greenville-Spartanburg SC
Urban PEI: 133,720 within a heuristic 50 km radius; not unique people.
Nearby, since 26 May 2026
- June 27, 2026 · score 43 · 0.0 km
- July 11, 2026 · score 39 · 6.9 km
- July 13, 2026 · score 43 · 7.3 km
How we know
8 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 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 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 |
| Legacy data-support index | 0.87/1 |
| Coordinates | 34.6043, -81.9118 |
| Nearest City | Simpsonville (34 km) |
| Urban exposure index (PEI) | 133.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-27T21:19:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.0a483f7bd7cc7b23553b639ffff10303 |
Physical priority index · v1. 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: 2026-06-27T21:19:00.000Z.
First archived: 2026-06-27T21:40:08.234Z. 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 | Abbeville, SC; Anderson, SC; Greenville, SC; Laurens, SC; Chester, SC; York, SC |
| Headline | Severe Thunderstorm Warning issued June 27 at 5:19PM EDT until June 27 at 6:15PM EDT by NWS Greenville-Spartanburg SC |
| Expires | 2026-06-27T18:15:00-04:00 |
| SenderName | NWS Greenville-Spartanburg SC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0a483f7bd7cc7b23553b639ffff103031c9d2a68.001.1","noaa_urn:oid:2.49.0.1.840.0.9dad4350905e25932be55652d2acaadfd0352fae.002.1"] |
| Iem TypeSummary | D |
| Iem City | 2 NNW Downtown Greenvil |
| Iem County | Greenville |
| Iem State | SC |
| Iem Wfo | GSP |
| Iem Remark | Social media picture of a large tree down along North Main St. |
| MergedSources | [{"id":"iem_D_34.870_-82.380_1782587940000","source":"iem","severity":"low","severityValue":25,"timestamp":1782587940000,"latitude":34.87,"longitude":-82.38},{"id":"iem_D_34.920_-82.280_1782588840000","source":"iem","severity":"low","severityValue":25,"timestamp":1782588840000,"latitude":34.92,"longitude":-82.28},{"id":"iem_D_34.480_-81.880_1782592440000","source":"iem","severity":"low","severityValue":25,"timestamp":1782592440000,"latitude":34.48,"longitude":-81.88},{"id":"iem_D_34.780_-82.670_1782586320000","source":"iem","severity":"low","severityValue":25,"timestamp":1782586320000,"latitude":34.78,"longitude":-82.67},{"id":"iem_D_34.720_-82.290_1782589140000","source":"iem","severity":"low","severityValue":25,"timestamp":1782589140000,"latitude":34.72,"longitude":-82.29},{"id":"iem_D_34.900_-82.330_1782588120000","source":"iem","severity":"low","severityValue":25,"timestamp":1782588120000,"latitude":34.9,"longitude":-82.33},{"id":"iem_D_34.870_-82.390_1782587880000","source":"iem","severity":"low","severityValue":25,"timestamp":1782587880000,"latitude":34.87,"longitude":-82.39}] |
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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