Right now
The most recent data we hold from NOAA arrived 34 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 1 August 2026 at 23:30 UTC. It is kept here as a record.
No stronger detection stands among the 63 recorded within 20 km of this point since 18 June 2026 — 7 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 1 at 6:15PM EDT until August 1 at 7:30PM EDT by NWS Columbia SC
Urban PEI: 220,443 within a heuristic 50 km radius; not unique people.
Nearby, since 18 June 2026
- July 6, 2026 · score 43 · 5.6 km
- August 1, 2026 · score 43 · 5.7 km
- September 6, 2026 · score 37 · 7.7 km
How we know
6 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 | 0.91/1 |
| Coordinates | 33.8708, -80.6011 |
| Nearest City | Sumter (25 km) |
| Urban exposure index (PEI) | 220.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-01T22:15:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.cf7f82b42f731708593b5a5c60b2cae0 |
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: 2026-08-01T22:15:00.000Z.
First archived: 2026-08-01T22:50:21.239Z. 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 | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lexington, SC; Richland, SC; Williamsburg, SC; Richland, SC |
| Headline | Flash Flood Warning issued August 1 at 6:15PM EDT until August 1 at 7:30PM EDT by NWS Columbia SC |
| Expires | 2026-08-01T19:30:00-04:00 |
| SenderName | NWS Columbia SC |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.cf7f82b42f731708593b5a5c60b2cae0a303bdbc.001.1","noaa_urn:oid:2.49.0.1.840.0.066bd560f30690ca0c966db9afb1b062485262fd.001.1","noaa_urn:oid:2.49.0.1.840.0.df5e25393934e4eed3470bbb75fb083edc82f04e.001.1"] |
| Iem TypeSummary | F |
| Iem City | 2 NE Owens Field |
| Iem County | Richland |
| Iem State | SC |
| Iem Wfo | CAE |
| Iem Remark | Columbia Fire responding to large flooded roadway at E Chapel Drive. |
| MergedSources | [{"id":"iem_F_34.000_-80.810_1785618060000","source":"iem","severity":"low","severityValue":25,"timestamp":1785618060000,"latitude":34,"longitude":-80.81},{"id":"iem_F_33.990_-80.970_1785615180000","source":"iem","severity":"low","severityValue":25,"timestamp":1785615180000,"latitude":33.99,"longitude":-80.97},{"id":"iem_F_33.990_-81.030_1785614940000","source":"iem","severity":"low","severityValue":25,"timestamp":1785614940000,"latitude":33.99,"longitude":-81.03},{"id":"iem_F_33.960_-80.980_1785618000000","source":"iem","severity":"low","severityValue":25,"timestamp":1785618000000,"latitude":33.96,"longitude":-80.98},{"id":"iem_F_33.990_-80.980_1785614280000","source":"iem","severity":"low","severityValue":25,"timestamp":1785614280000,"latitude":33.99,"longitude":-80.98}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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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