Right now
The most recent data we hold from NOAA arrived 4 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 14 August 2026 at 02:30 UTC. It is kept here as a record.
It is the 7th strongest of the 44 detections recorded within 20 km of this point since 16 March 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: Flash Flood Warning issued August 13 at 7:30PM EDT until August 13 at 10:30PM EDT by NWS Charleston SC
An estimated 429,708 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 5, 2026 · score 43 · 4.4 km
- June 14, 2026 · score 43 · 16.5 km
- July 5, 2026 · score 43 · 17.9 km
How we know
Confirmed by 21 independent sources, including NOAA.
Our own score for this event is 37 out of 100, at 92 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 37 / 100 |
| Our confidence | 92% |
| Coordinates | 32.8985, -80.2575 |
| Nearest City | Summerville (15 km) |
| Population Exposed | 429.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-13T23:30:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.5479b14f949f9426f94ab4d3cd8b24ca23d7dcfb.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Dorchester, SC |
| Headline | Flash Flood Warning issued August 13 at 7:30PM EDT until August 13 at 10:30PM EDT by NWS Charleston SC |
| Expires | 2026-08-13T22:30:00-04:00 |
| SenderName | NWS Charleston SC |
| HasExactCoords | true |
| Iem TypeSummary | R |
| Iem Magnitude | 2.4 |
| Iem Unit | inch |
| Iem City | 2 SSW Knightsville |
| Iem County | Dorchester |
| Iem State | SC |
| Iem Wfo | CHS |
| Iem Remark | Trained spotter located near Pheobe Rd and Bateaux Dr reported 2.40 inches of rain so far. Rain fell within the past 35 minutes. |
| MergedSources | [{"id":"iem_I_32.700_-80.010_1786644900000","source":"iem","severity":"low","severityValue":25,"timestamp":1786644900000,"latitude":32.7,"longitude":-80.01},{"id":"iem_R_32.890_-80.260_1786666740000","source":"iem","severity":"low","severityValue":25,"timestamp":1786666740000,"latitude":32.89,"longitude":-80.26},{"id":"iem_M_32.750_-79.900_1786664580000","source":"iem","severity":"low","severityValue":25,"timestamp":1786664580000,"latitude":32.75,"longitude":-79.9},{"id":"iem_I_32.770_-79.920_1786645800000","source":"iem","severity":"low","severityValue":25,"timestamp":1786645800000,"latitude":32.77,"longitude":-79.92},{"id":"iem_D_33.100_-80.290_1786659720000","source":"iem","severity":"low","severityValue":25,"timestamp":1786659720000,"latitude":33.1,"longitude":-80.29},{"id":"iem_I_33.250_-80.040_1786652400000","source":"iem","severity":"low","severityValue":25,"timestamp":1786652400000,"latitude":33.25,"longitude":-80.04},{"id":"iem_R_32.570_-80.320_1786654800000","source":"iem","severity":"low","severityValue":25,"timestamp":1786654800000,"latitude":32.57,"longitude":-80.32},{"id":"iem_R_32.950_-80.260_1786665840000","source":"iem","severity":"low","severityValue":25,"timestamp":1786665840000,"latitude":32.95,"longitude":-80.26},{"id":"iem_I_32.970_-79.670_1786650420000","source":"iem","severity":"low","severityValue":25,"timestamp":1786650420000,"latitude":32.97,"longitude":-79.67},{"id":"iem_I_32.560_-80.460_1786646700000","source":"iem","severity":"low","severityValue":25,"timestamp":1786646700000,"latitude":32.56,"longitude":-80.46},{"id":"iem_I_32.980_-79.800_1786643520000","source":"iem","severity":"low","severityValue":25,"timestamp":1786643520000,"latitude":32.98,"longitude":-79.8},{"id":"iem_R_32.950_-80.230_1786665840000","source":"iem","severity":"low","severityValue":25,"timestamp":1786665840000,"latitude":32.95,"longitude":-80.23},{"id":"iem_R_32.930_-80.250_1786666140000","source":"iem","severity":"low","severityValue":25,"timestamp":1786666140000,"latitude":32.93,"longitude":-80.25},{"id":"iem_D_32.940_-80.730_1786658820000","source":"iem","severity":"low","severityValue":25,"timestamp":1786658820000,"latitude":32.94,"longitude":-80.73},{"id":"iem_I_32.560_-80.460_1786653000000","source":"iem","severity":"low","severityValue":25,"timestamp":1786653000000,"latitude":32.56,"longitude":-80.46},{"id":"iem_I_33.160_-79.830_1786648380000","source":"iem","severity":"low","severityValue":25,"timestamp":1786648380000,"latitude":33.16,"longitude":-79.83},{"id":"iem_I_32.900_-80.090_1786653000000","source":"iem","severity":"low","severityValue":25,"timestamp":1786653000000,"latitude":32.9,"longitude":-80.09},{"id":"iem_I_32.980_-79.800_1786651080000","source":"iem","severity":"low","severityValue":25,"timestamp":1786651080000,"latitude":32.98,"longitude":-79.8},{"id":"iem_M_32.640_-79.970_1786665900000","source":"iem","severity":"low","severityValue":25,"timestamp":1786665900000,"latitude":32.64,"longitude":-79.97},{"id":"iem_R_32.980_-80.260_1786663200000","source":"iem","severity":"low","severityValue":25,"timestamp":1786663200000,"latitude":32.98,"longitude":-80.26}] |
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.
Want to know when something happens near Summerville?
Calamity.live data shows a weather event with CalamityScore 37/100, near Summerville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.