Right now
The most recent data we hold from NOAA arrived 2 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 May 2026 at 22:45 UTC. It is kept here as a record.
No stronger detection stands among the 11 recorded within 20 km of this point since 19 May 2026 — 2 others scored the same.
What the source measured
NOAA reported: Special Marine Warning issued May 19 at 5:51PM EDT until May 19 at 6:45PM EDT by NWS Boston/Norton MA
An estimated 3,189,555 people live within 50 km of this point.
Nearby, since 19 May 2026
- May 19, 2026 · score 52 · 4.8 km
- August 13, 2026 · score 43 · 19.0 km
- July 22, 2026 · score 52 · 19.4 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 86 % 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) | 52 / 100 |
| Our confidence | 86% |
| Coordinates | 42.4018, -70.5627 |
| Nearest City | Gloucester (24 km) |
| Population Exposed | 3.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T21:51:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.c9a3d7af2f8e79df44bf48c6f9721baca5478fee.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Boston Harbor; Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary; Massachusetts Bay and Ipswich Bay; Ocean Waters from the Merrimack River to Plymouth from 40 to 60 NM |
| Headline | Special Marine Warning issued May 19 at 5:51PM EDT until May 19 at 6:45PM EDT by NWS Boston/Norton MA |
| Expires | 2026-05-19T18:45:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | true |
| Iem TypeSummary | M |
| Iem Magnitude | 63 |
| Iem Unit | MPH |
| Iem City | 8 ESE Rye |
| Iem County | ANZ154 |
| Iem State | NH |
| Iem Wfo | GYX |
| Iem Remark | Appledore Island. |
| MergedSources | [{"id":"iem_M_42.970_-70.620_1779225540000","source":"iem","severity":"low","severityValue":25,"timestamp":1779225540000,"latitude":42.97,"longitude":-70.62}] |
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 near Gloucester?
Calamity.live data shows a weather event with CalamityScore 52/100, near Gloucester (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.