Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is in it.
One other detection within 20 km in the last 24 hours, <1 km from here.
This alert expired on 11 September 2026 at 22:32 UTC. It is kept here as a record.
It is the 6th strongest of the 31 detections recorded within 20 km of this point since 12 June 2026. 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 September 11 at 6:22PM EDT until September 11 at 6:30PM EDT by NWS Charleston SC
An estimated 348,391 people live within 50 km of this point.
Nearby, since 12 June 2026
- September 11, 2026 · score 37 · 0.0 km
- September 5, 2026 · score 37 · 12.3 km
- June 18, 2026 · score 43 · 14.1 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 37 out of 100, at 85 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. 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 |
| Our confidence | 85% |
| Coordinates | 32.7856, -80.4422 |
| Nearest City | Summerville (36 km) |
| Population Exposed | 348.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-11T22:22:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.b416a6f4ee125fdb24b09406062ef0a94ecbe950.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Charleston, SC; Colleton, SC |
| Headline | Flash Flood Warning issued September 11 at 6:22PM EDT until September 11 at 6:30PM EDT by NWS Charleston SC |
| Expires | 2026-09-11T18:32:00-04:00 |
| SenderName | NWS Charleston SC |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 1 SSW West Ashley |
| Spc County | Charleston |
| Spc State | SC |
| Spc Comments | SCDPS reports a tree down near the intersection of Pearlott St and Wappoo Rd. Time estimated from radar. (CHS) |
| MergedSources | [{"id":"spc_wind_32.79_-80.02_1","source":"spc","severity":"medium","severityValue":45,"timestamp":1789155600000,"latitude":32.79,"longitude":-80.02}] |
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.
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