This alert expired on 5 July 2026 at 02:30 UTC. It is kept here as a record.
No stronger detection stands among the 30 recorded within 20 km of this point since 16 March 2026 — 5 others scored the same. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 4 at 10:16PM EDT until July 4 at 10:30PM EDT by NWS Boston/Norton MA
An estimated 337,127 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 5, 2026 · score 43 · 13.5 km
- July 19, 2026 · score 43 · 13.8 km
- July 30, 2026 · score 43 · 14.2 km
How we know
Confirmed by 10 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 90 % 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) | 43 / 100 |
| Our confidence | 90% |
| Coordinates | 41.2731, -71.6804 |
| Nearest City | Westerly (17 km) |
| Population Exposed | 337.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-05T02:16:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.6a57406e41933af0e4a01a9886057fcf |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Washington, RI |
| Headline | Severe Thunderstorm Warning issued July 4 at 10:16PM EDT until July 4 at 10:30PM EDT by NWS Boston/Norton MA |
| Expires | 2026-07-04T22:30:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6a57406e41933af0e4a01a9886057fcf2a7b045e.001.1","noaa_urn:oid:2.49.0.1.840.0.dfcecaa2ee054c3d856cc16b1ae778076ab4292f.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 66 |
| Iem Unit | MPH |
| Iem City | 2 SE Watermill |
| Iem County | Suffolk |
| Iem State | NY |
| Iem Wfo | OKX |
| Iem Remark | Mecox Bay Mesonet. |
| MergedSources | [{"id":"iem_M_41.370_-71.540_1783213620000","source":"iem","severity":"low","severityValue":25,"timestamp":1783213620000,"latitude":41.37,"longitude":-71.54},{"id":"iem_D_41.150_-72.280_1783216200000","source":"iem","severity":"low","severityValue":25,"timestamp":1783216200000,"latitude":41.15,"longitude":-72.28},{"id":"iem_D_41.320_-71.850_1783215720000","source":"iem","severity":"low","severityValue":25,"timestamp":1783215720000,"latitude":41.32,"longitude":-71.85},{"id":"iem_D_41.380_-72.040_1783214700000","source":"iem","severity":"low","severityValue":25,"timestamp":1783214700000,"latitude":41.38,"longitude":-72.04},{"id":"iem_M_41.320_-71.790_1783217400000","source":"iem","severity":"low","severityValue":25,"timestamp":1783217400000,"latitude":41.32,"longitude":-71.79},{"id":"iem_M_41.010_-72.060_1783216080000","source":"iem","severity":"low","severityValue":25,"timestamp":1783216080000,"latitude":41.01,"longitude":-72.06},{"id":"iem_G_40.910_-72.320_1783215540000","source":"iem","severity":"low","severityValue":25,"timestamp":1783215540000,"latitude":40.91,"longitude":-72.32},{"id":"iem_M_41.320_-71.840_1783215120000","source":"iem","severity":"low","severityValue":25,"timestamp":1783215120000,"latitude":41.32,"longitude":-71.84},{"id":"iem_M_40.910_-72.320_1783215540000","source":"iem","severity":"low","severityValue":25,"timestamp":1783215540000,"latitude":40.91,"longitude":-72.32}] |
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 Westerly?
Calamity.live data shows a weather event with CalamityScore 43/100, near Westerly (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.