Right now
The most recent data we hold from NOAA arrived 23 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 3 August 2026 at 01:00 UTC. It is kept here as a record.
It is the 16th strongest of the 25 detections recorded within 20 km of this point since 8 March 2026. The last comparable one was on 25 July 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 2 at 7:30PM EDT until August 2 at 9:00PM EDT by NWS Charleston SC
Urban PEI: 213,926 within a heuristic 50 km radius; not unique people.
Nearby, since 8 March 2026
- March 16, 2026 · score 49 · 1.9 km
- May 7, 2026 · score 43 · 4.0 km
- August 3, 2026 · score 43 · 4.3 km
How we know
4 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 37 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) | 37 / 100 |
| Legacy data-support index | 0.91/1 |
| Coordinates | 32.8894, -79.4294 |
| Nearest City | Mount Pleasant (42 km) |
| Urban exposure index (PEI) | 213.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-02T23:30:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.25bb13fcfb1d097095b8a0bb25b89a7e2f19277b.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: 2026-08-02T23:30:00.000Z.
First archived: 2026-08-03T00:13:06.272Z. 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 | Charleston Harbor; 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 |
| Headline | Special Marine Warning issued August 2 at 7:30PM EDT until August 2 at 9:00PM EDT by NWS Charleston SC |
| Expires | 2026-08-02T21:00:00-04:00 |
| SenderName | NWS Charleston SC |
| HasExactCoords | true |
| Iem TypeSummary | M |
| Iem Magnitude | 39 |
| Iem Unit | mph |
| Iem City | 1 ESE Isle of Palms |
| Iem County | AMZ360 |
| Iem State | SC |
| Iem Wfo | CHS |
| Iem Remark | Isle of Palms Pier had a marine thunderstorm wind gust of 39 mph (34 knots) |
| MergedSources | [{"id":"iem_M_32.750_-79.870_1785712860000","source":"iem","severity":"low","severityValue":25,"timestamp":1785712860000,"latitude":32.75,"longitude":-79.87},{"id":"iem_M_32.760_-79.950_1785712020000","source":"iem","severity":"low","severityValue":25,"timestamp":1785712020000,"latitude":32.76,"longitude":-79.95},{"id":"iem_M_32.780_-79.790_1785713280000","source":"iem","severity":"low","severityValue":25,"timestamp":1785713280000,"latitude":32.78,"longitude":-79.79}] |
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.
Review the area, threshold and delivery channel in your account.
Want to know when something happens in this area?