Right now
The most recent data we hold from SPC arrived 6 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
2 other detections within 20 km in the last 24 hours, the nearest 5 km from here.
Reported by SPC 22 days ago.
No stronger detection stands among the 305 recorded within 20 km of this point since 12 March 2026 — 19 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
SPC reported: Hail 100 in near Williamstown, Gloucester, NJ. Quarter size hail reported in Williamstown. (PHI)
Urban PEI: 3,476,278 within a heuristic 50 km radius; not unique people.
Nearby, since 12 March 2026
- March 17, 2026 · score 52 · 0.0 km
- July 3, 2026 · score 52 · 4.5 km
- July 6, 2026 · score 52 · 5.6 km
How we know
2 recorded sources include SPC; independence is not established by this count.
Our own score for this event is 58 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 v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | High |
| Calamity Score (ours) | 58 / 100 |
| Legacy data-support index | 0.86/1 |
| Coordinates | 39.6900, -74.9900 |
| Nearest City | Williamstown (1 km) |
| Urban exposure index (PEI) | 3.5M within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-02T00:28:00.000Z |
| Source | https://www.spc.noaa.gov/climo/reports/today.html |
Physical priority index · v4 (historical). 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: spc. Occurrence: 2026-09-02T00:28:00.000Z.
First archived: 2026-09-02T04:05:58.642Z. 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
| ReportType | hail |
| Speed | 100 |
| Location | Williamstown |
| County | Gloucester |
| State | NJ |
| Comments | Quarter size hail reported in Williamstown. (PHI) |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | Williamstown |
| Iem County | Gloucester |
| Iem State | NJ |
| Iem Wfo | PHI |
| Iem Remark | Quarter size hail reported in Williamstown. |
| MergedSources | [{"id":"iem_H_39.700_-75.020_1788308280000","source":"iem","severity":"low","severityValue":25,"timestamp":1788308280000,"latitude":39.7,"longitude":-75.02},{"id":"iem_H_39.710_-75.030_1788308280000","source":"iem","severity":"low","severityValue":25,"timestamp":1788308280000,"latitude":39.71,"longitude":-75.03},{"id":"iem_F_39.690_-75.000_1788312000000","source":"iem","severity":"low","severityValue":25,"timestamp":1788312000000,"latitude":39.69,"longitude":-75},{"id":"iem_H_39.690_-74.990_1788308880000","source":"iem","severity":"low","severityValue":25,"timestamp":1788308880000,"latitude":39.69,"longitude":-74.99}] |
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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