Right now
The most recent data we hold from NOAA arrived 9 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 4 July 2026 at 19:45 UTC. It is kept here as a record.
It is the 6th strongest of the 19 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 4 at 3:04PM EDT until July 4 at 3:45PM EDT by NWS Boston/Norton MA
Urban PEI: 800,143 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- June 26, 2026 · score 52 · 11.4 km
- July 4, 2026 · score 48 · 13.2 km
- August 8, 2026 · score 52 · 14.1 km
How we know
5 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 48 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) | 48 / 100 |
| Legacy data-support index | 0.87/1 |
| Coordinates | 42.7100, -70.5686 |
| Nearest City | Gloucester (13 km) |
| Urban exposure index (PEI) | 800.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T19:04:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.1f2dfe7d2804e75613401aa457174abb3726d159.001.1 |
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: 2026-07-04T19:04:00.000Z.
First archived: 2026-07-04T19:44:08.383Z. 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 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 July 4 at 3:04PM EDT until July 4 at 3:45PM EDT by NWS Boston/Norton MA |
| Expires | 2026-07-04T15:45:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | true |
| Iem TypeSummary | M |
| Iem Magnitude | 40 |
| Iem Unit | MPH |
| Iem City | 2 ENE Ipswich |
| Iem County | ANZ251 |
| Iem State | MA |
| Iem Wfo | BOX |
| Iem Remark | Mesonet station on Little Neck. |
| MergedSources | [{"id":"iem_M_42.890_-70.810_1783190640000","source":"iem","severity":"low","severityValue":25,"timestamp":1783190640000,"latitude":42.89,"longitude":-70.81},{"id":"iem_M_42.990_-70.620_1783191240000","source":"iem","severity":"low","severityValue":25,"timestamp":1783191240000,"latitude":42.99,"longitude":-70.62},{"id":"iem_M_42.660_-70.600_1783192140000","source":"iem","severity":"low","severityValue":25,"timestamp":1783192140000,"latitude":42.66,"longitude":-70.6},{"id":"iem_M_42.690_-70.800_1783191840000","source":"iem","severity":"low","severityValue":25,"timestamp":1783191840000,"latitude":42.69,"longitude":-70.8}] |
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.
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