This alert expired on 15 July 2026 at 21:00 UTC. It is kept here as a record.
It is the 15th strongest of the 174 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 20 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 15 at 4:35PM EDT until July 15 at 5:00PM EDT by NWS Mount Holly NJ
An estimated 26,378,267 people live within 50 km of this point.
Nearby, since 12 March 2026
- August 3, 2026 · score 66 · 1.9 km
- July 21, 2026 · score 46 · 5.0 km
- July 21, 2026 · score 76 · 5.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 81 % 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 | 81% |
| Coordinates | 40.8533, -74.3676 |
| Nearest City | Parsippany (5 km) |
| Population Exposed | 26.4M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-15T20:35:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.b2277c0a1d0e8b2dce43bea2a67e8f6b |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Morris, NJ; Somerset, NJ; Sussex, NJ; Warren, NJ; Bergen, NJ; Essex, NJ; Hudson, NJ; Passaic, NJ; Union, NJ; Bronx, NY; New York, NY; Morris, NJ; Sussex, NJ |
| Headline | Severe Thunderstorm Warning issued July 15 at 4:35PM EDT until July 15 at 5:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-15T17:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b2277c0a1d0e8b2dce43bea2a67e8f6bcfd79a9b.001.1","noaa_urn:oid:2.49.0.1.840.0.3c15db09090cb3936e598d19d17a3e0b39bb1fd6.001.1","noaa_urn:oid:2.49.0.1.840.0.6ed49ba52e86e0f8063c3c835afcc433026a7ab3.001.1"] |
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 Parsippany (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.