Right now
The most recent data we hold from NOAA arrived 9 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 May 2026 at 22:15 UTC. It is kept here as a record.
No stronger detection stands among the 6 recorded within 20 km of this point since 11 May 2026 — 5 others scored the same.
What the source measured
NOAA reported: Special Marine Warning issued May 11 at 5:42PM EDT until May 11 at 6:15PM EDT by NWS Charleston SC
Nearby, since 11 May 2026
- June 19, 2026 · score 22 · 14.9 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, at 61 % 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) | 22 / 100 |
| Our confidence | 61% |
| Coordinates | 32.9214, -78.5395 |
| Nearest City | Myrtle Beach (91 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-11T21:42:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.2f191de78c2276f849a2febdd10726ce |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Coastal waters from South Santee River to Edisto Beach SC out 20 NM; Waters from South Santee River SC to Edisto Beach SC extending from 20 to 60 NM; Waters from Surf City NC to Little River Inlet SC from 20 to 60 NM; Waters from Little River Inlet SC to South Santee River SC from 20 to 60 NM |
| Headline | Special Marine Warning issued May 11 at 5:42PM EDT until May 11 at 6:15PM EDT by NWS Charleston SC |
| Expires | 2026-05-11T18:15:00-04:00 |
| SenderName | NWS Charleston SC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2f191de78c2276f849a2febdd10726ce0a322986.001.1","noaa_urn:oid:2.49.0.1.840.0.e6388405c0d19aea9ddc15f176331d02a9e01cc0.001.1"] |
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.