Right now
The most recent data we hold from NOAA arrived 1 minute 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 19 June 2026 at 14:45 UTC. It is kept here as a record.
It is the 7th strongest of the 20 detections recorded within 20 km of this point since 8 March 2026. The last comparable one was on 8 March 2026.
What the source measured
NOAA reported: Special Marine Warning issued June 19 at 8:51AM EDT until June 19 at 10:45AM EDT by NWS Charleston SC
Urban PEI: 81,317 within a heuristic 50 km radius; not unique people.
Nearby, since 8 March 2026
- August 6, 2026 · score 43 · 17.7 km
- March 8, 2026 · score 22 · 19.6 km
- August 27, 2026 · score 37 · 20.9 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 39 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) | 39 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 32.5821, -79.3962 |
| Nearest City | Mount Pleasant (49 km) |
| Urban exposure index (PEI) | 81.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-19T12:51:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.5c4bee6528f8d03cdcf2ca83debed365 |
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: 2026-06-19T12:51:00.000Z.
First archived: 2026-06-19T13:02:19.338Z. 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 | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Waters from South Santee River SC to Edisto Beach SC extending from 20 to 60 NM; Coastal waters from South Santee River to Edisto Beach SC out 20 NM; Coastal waters from Edisto Beach SC to Savannah GA out 20 NM; Waters from South Santee River SC to Edisto Beach SC extending from 20 to 60 NM; Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM |
| Headline | Special Marine Warning issued June 19 at 8:51AM EDT until June 19 at 10:45AM EDT by NWS Charleston SC |
| Expires | 2026-06-19T10:45:00-04:00 |
| SenderName | NWS Charleston SC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5c4bee6528f8d03cdcf2ca83debed365c49d813c.001.1","noaa_urn:oid:2.49.0.1.840.0.9d918640f68c60b33508355635ee47b53716c9bc.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 53 |
| Iem Unit | mph |
| Iem City | 2 WSW Folly Beach |
| Iem County | Charleston |
| Iem State | SC |
| Iem Wfo | CHS |
| MergedSources | [{"id":"iem_M_32.750_-79.870_1781870340000","source":"iem","severity":"low","severityValue":25,"timestamp":1781870340000,"latitude":32.75,"longitude":-79.87},{"id":"iem_M_32.640_-79.970_1781871300000","source":"iem","severity":"low","severityValue":25,"timestamp":1781871300000,"latitude":32.64,"longitude":-79.97}] |
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.
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