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 11 July 2026 at 20:03 UTC. It is kept here as a record.
It is the 9th strongest of the 28 detections recorded within 20 km of this point since 5 July 2026. Another comparable one was recorded here earlier the same day. 14 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 11 at 3:54PM EDT until July 11 at 4:00PM EDT by NWS Columbia SC
Nearby, since 5 July 2026
- August 27, 2026 · score 34 · 7.6 km
- July 11, 2026 · score 34 · 10.0 km
- July 20, 2026 · score 34 · 10.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 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) | 22 / 100 |
| Legacy data-support index | 0.60/1 |
| Coordinates | 33.4680, -80.3385 |
| Nearest City | Sumter (50 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-11T19:54:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.5bb01bd9daf2a8edde867781f2553376 |
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: 2026-07-11T19:54:00.000Z.
First archived: 2026-07-11T19:59:39.618Z. 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 | Calhoun, SC; Clarendon, SC; Orangeburg, SC; Richland, SC; Sumter, SC; Clarendon, SC; Orangeburg, SC; Brunswick, NC; Columbus, NC; Georgetown, SC; Horry, SC and 2 more areas |
| Headline | Severe Thunderstorm Warning issued July 11 at 3:54PM EDT until July 11 at 4:00PM EDT by NWS Columbia SC |
| Expires | 2026-07-11T16:03:00-04:00 |
| SenderName | NWS Columbia SC |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5bb01bd9daf2a8edde867781f2553376ecddbb43.001.1","noaa_urn:oid:2.49.0.1.840.0.fdbafbb7482eab7c3a54e518534447d210deab86.001.1","noaa_urn:oid:2.49.0.1.840.0.4bfc5cc3f357392d9de31f2fb309fc803aa062a9.001.1","noaa_urn:oid:2.49.0.1.840.0.39b9f99f2e99181d9f62977f8d26c10b7f33334b.002.1","noaa_urn:oid:2.49.0.1.840.0.a09db9a2d8c99fd56d1cd4a66b3374d28eaef23e.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.
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