This alert expired on 11 August 2026 at 21:45 UTC. It is kept here as a record.
No stronger detection stands among the 42 recorded within 20 km of this point since 16 March 2026 — 14 others scored the same. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 11 at 5:25PM EDT until August 11 at 5:45PM EDT by NWS Charleston SC
An estimated 280,390 people live within 50 km of this point.
Nearby, since 16 March 2026
- June 21, 2026 · score 43 · 13.1 km
- August 10, 2026 · score 43 · 14.4 km
- July 12, 2026 · score 43 · 14.9 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 91 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 91% |
| Coordinates | 32.2150, -80.7721 |
| Nearest City | Hilton Head (2 km) |
| Population Exposed | 280.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T21:25:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.00bd44cdbd41a69642ffe69ddbd08965177f44ef.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Beaufort, SC; Jasper, SC |
| Headline | Severe Thunderstorm Warning issued August 11 at 5:25PM EDT until August 11 at 5:45PM EDT by NWS Charleston SC |
| Expires | 2026-08-11T17:45:00-04:00 |
| SenderName | NWS Charleston SC |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 52 |
| Iem Unit | mph |
| Iem City | Ridgeland Airport |
| Iem County | Jasper |
| Iem State | SC |
| Iem Wfo | CHS |
| Iem Remark | Peak wind gust of 52 mph at the Ridgeland-Claude Dean Airport (K3J1). |
| MergedSources | [{"id":"iem_R_32.570_-80.320_1786482000000","source":"iem","severity":"low","severityValue":25,"timestamp":1786482000000,"latitude":32.57,"longitude":-80.32},{"id":"iem_M_32.500_-80.290_1786480800000","source":"iem","severity":"low","severityValue":25,"timestamp":1786480800000,"latitude":32.5,"longitude":-80.29},{"id":"iem_G_32.130_-81.200_1786478700000","source":"iem","severity":"low","severityValue":25,"timestamp":1786478700000,"latitude":32.13,"longitude":-81.2},{"id":"iem_G_32.500_-80.990_1786480500000","source":"iem","severity":"low","severityValue":25,"timestamp":1786480500000,"latitude":32.5,"longitude":-80.99}] |
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 10 February 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 Hilton Head?
Calamity.live data shows a weather event with CalamityScore 43/100, near Hilton Head (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.