This alert expired on 6 July 2026 at 00:30 UTC. It is kept here as a record.
It is the 6th strongest of the 212 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 13 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 5 at 7:39PM EDT until July 5 at 8:30PM EDT by NWS Mount Holly NJ
An estimated 2,231,706 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 9, 2026 · score 52 · 3.9 km
- March 17, 2026 · score 52 · 4.6 km
- June 22, 2026 · score 52 · 6.1 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 66 out of 100, at 83 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | critical |
| Calamity Score (ours) | 66 / 100 |
| Our confidence | 83% |
| Coordinates | 39.1124, -76.3020 |
| Nearest City | Lake Shore (15 km) |
| Population Exposed | 2.2M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-07-05T23:39:00.000Z |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Delaware Bay waters north of East Point NJ to Slaughter Beach DE; Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD |
| Headline | Special Marine Warning issued July 5 at 7:39PM EDT until July 5 at 8:30PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-05T20:30:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a7e7df0b1546163973da8509b48b0bd99fdc0668.001.1","noaa_urn:oid:2.49.0.1.840.0.f0755f5b2d79aa799a9288e6745ab89a363b3a7b.001.1"] |
| Ogimet StationId | 72503 |
| Ogimet WindSpeed | 84 |
| Ogimet WindUnit | knots |
| Ogimet Temperature | 25 |
| Ogimet TemperatureUnit | C |
| Ogimet RawSynop | 07,05,17,51,AAXX 05184 72503 32466 80411 10250 20211 30139 40150 50000 91751 333 10256 20239 555 90518= |
| MergedSources | [{"id":"ogimet_72503_1783295080722","source":"ogimet","severity":"critical","severityValue":90,"timestamp":1783295080722,"latitude":38.9,"longitude":-77}] |
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.
Calamity.live data shows a weather event with CalamityScore 66/100, near Lake Shore (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.