Right now
The most recent data we hold from NOAA arrived 3 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 5 July 2026 at 02:30 UTC. It is kept here as a record.
No stronger detection stands among the 45 recorded within 20 km of this point since 17 March 2026 — 23 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 9:46PM EDT until July 4 at 10:30PM EDT by NWS Upton NY
Urban PEI: 201,879 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- July 21, 2026 · score 37 · 11.8 km
- June 7, 2026 · score 43 · 14.9 km
- March 17, 2026 · score 43 · 17.0 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 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) | 43 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 41.2657, -71.9369 |
| Nearest City | Westerly (16 km) |
| Urban exposure index (PEI) | 201.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-05T01:46:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.ab4d9deafb548a447c5acde55631613c |
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: 2026-07-05T01:46:00.000Z.
First archived: 2026-07-05T01:49:36.495Z. 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 | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | New London, CT; Suffolk, NY; Washington, RI |
| Headline | Severe Thunderstorm Warning issued July 4 at 9:46PM EDT until July 4 at 10:30PM EDT by NWS Upton NY |
| Expires | 2026-07-04T22:30:00-04:00 |
| SenderName | NWS Upton NY |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ab4d9deafb548a447c5acde55631613c062e3d27.001.1","noaa_urn:oid:2.49.0.1.840.0.0a3e73903323328665f7f0679e0a5a953d9f7ba6.001.1"] |
| Iem TypeSummary | D |
| Iem City | 2 NNW Poquonock Bridge |
| Iem County | New London |
| Iem State | CT |
| Iem Wfo | OKX |
| Iem Remark | Multiple trees down across northern Groton. |
| 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_41.380_-72.040_1783214700000","source":"iem","severity":"low","severityValue":25,"timestamp":1783214700000,"latitude":41.38,"longitude":-72.04}] |
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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