This alert expired on 27 August 2026 at 17:30 UTC. It is kept here as a record.
It is the 6th strongest of the 345 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 27 at 1:06PM EDT until August 27 at 1:30PM EDT by NWS Mount Holly NJ
An estimated 26,757,070 people live within 50 km of this point.
Nearby, since 12 March 2026
- August 28, 2026 · score 46 · 2.7 km
- July 18, 2026 · score 52 · 3.0 km
- July 28, 2026 · score 52 · 4.0 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.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 86% |
| Coordinates | 40.5279, -74.1975 |
| Nearest City | Woodrow (1 km) |
| Population Exposed | 26.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-27T17:06:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.13bfee3e8351523345f8125695ed95a8 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Middlesex, NJ; Richmond, NY |
| Headline | Severe Thunderstorm Warning issued August 27 at 1:06PM EDT until August 27 at 1:30PM EDT by NWS Mount Holly NJ |
| Expires | 2026-08-27T13:30:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.13bfee3e8351523345f8125695ed95a8bcb8234c.001.1","noaa_urn:oid:2.49.0.1.840.0.a15911ca280e317fdf830ed5c7c20b5388729b4f.001.1"] |
| Iem TypeSummary | E |
| Iem City | Byram |
| Iem County | Sussex |
| Iem State | NJ |
| Iem Wfo | PHI |
| Iem Remark | Flooding on US 206 in both directions North of CR 607/Lackawanna Dr in Byram Twp. All lanes closed northbound; closed southbound. |
| MergedSources | [{"id":"iem_E_40.930_-74.720_1787838000000","source":"iem","severity":"low","severityValue":25,"timestamp":1787838000000,"latitude":40.93,"longitude":-74.72}] |
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 52/100, near Woodrow (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.