Right now
The most recent data we hold from NOAA arrived 22 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 19 June 2026 at 03:15 UTC. It is kept here as a record.
No stronger detection stands among the 5 recorded within 20 km of this point since 19 June 2026 — 4 others scored the same.
What the source measured
NOAA reported: Special Marine Warning issued June 18 at 9:21PM EDT until June 18 at 11:15PM EDT by NWS Charleston SC
Nearby, since 19 June 2026
- July 27, 2026 · score 22 · 17.5 km
How we know
6 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 22 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) | 22 / 100 |
| Legacy data-support index | 0.70/1 |
| Coordinates | 32.1686, -79.7129 |
| Nearest City | Mount Pleasant (70 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-19T01:21:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.63a07811a3f16b01e5a85def9c38ea04a9d7b6b3.001.1 |
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: 2026-06-19T01:21:00.000Z.
First archived: 2026-06-19T02:36:57.963Z. 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 | 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 18 at 9:21PM EDT until June 18 at 11:15PM EDT by NWS Charleston SC |
| Expires | 2026-06-18T23:15:00-04:00 |
| SenderName | NWS Charleston SC |
| HasExactCoords | true |
| Iem TypeSummary | M |
| Iem Magnitude | 43 |
| Iem Unit | mph |
| Iem City | 4 ESE Charleston |
| Iem County | AMZ340 |
| Iem State | SC |
| Iem Wfo | CHS |
| Iem Remark | Fort Sumter WxFlow sensor reported a 37 knot wind gust. |
| MergedSources | [{"id":"iem_M_32.770_-79.910_1781820600000","source":"iem","severity":"low","severityValue":25,"timestamp":1781820600000,"latitude":32.77,"longitude":-79.91},{"id":"iem_D_32.720_-80.120_1781819400000","source":"iem","severity":"low","severityValue":25,"timestamp":1781819400000,"latitude":32.72,"longitude":-80.12},{"id":"iem_D_32.670_-80.200_1781819160000","source":"iem","severity":"low","severityValue":25,"timestamp":1781819160000,"latitude":32.67,"longitude":-80.2},{"id":"iem_D_32.790_-79.780_1781821020000","source":"iem","severity":"low","severityValue":25,"timestamp":1781821020000,"latitude":32.79,"longitude":-79.78},{"id":"iem_M_32.750_-79.870_1781821140000","source":"iem","severity":"low","severityValue":25,"timestamp":1781821140000,"latitude":32.75,"longitude":-79.87}] |
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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