Right now
The most recent data we hold from NOAA arrived 8 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 22 June 2026 at 21:30 UTC. It is kept here as a record.
No stronger detection stands among the 231 recorded within 20 km of this point since 14 March 2026 — 4 others scored the same. Another comparable one was recorded here earlier the same day. 19 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued June 22 at 4:56PM EDT until June 22 at 5:30PM EDT by NWS Mount Holly NJ
Urban PEI: 3,184,953 within a heuristic 50 km radius; not unique people.
Nearby, since 14 March 2026
- June 22, 2026 · score 76 · 4.3 km
- June 22, 2026 · score 76 · 5.1 km
- July 11, 2026 · score 52 · 6.7 km
How we know
7 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 76 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 | Critical |
| Calamity Score (ours) | 76 / 100 |
| Legacy data-support index | 0.87/1 |
| Coordinates | 40.0420, -75.6080 |
| Nearest City | West Chester (9 km) |
| Urban exposure index (PEI) | 3.2M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-06-22T20:56:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.8ff87f28f0299a1a5c3311114250d5468ccdc587.001.1 |
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: 2026-06-22T20:56:00.000Z.
First archived: 2026-06-22T21:05:42.131Z. 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 | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Chester, PA; Delaware, PA; Montgomery, PA |
| Headline | Tornado Warning issued June 22 at 4:56PM EDT until June 22 at 5:30PM EDT by NWS Mount Holly NJ |
| Expires | 2026-06-22T17:30:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1.5 |
| Iem Unit | Inch |
| Iem City | 1 NE Burlington Twp |
| Iem County | Burlington |
| Iem State | NJ |
| Iem Wfo | PHI |
| Iem Remark | 2 minutes of hail up to 1.5 inch diameter. Time estimated from radar. |
| Google News RssFeed | weather |
| Google News SourceName | FOX 29 Philadelphia |
| MergedSources | [{"id":"iem_H_40.080_-74.810_1782154080000","source":"iem","severity":"low","severityValue":25,"timestamp":1782154080000,"latitude":40.08,"longitude":-74.81},{"id":"iem_H_40.080_-74.820_1782154080000","source":"iem","severity":"low","severityValue":25,"timestamp":1782154080000,"latitude":40.08,"longitude":-74.82},{"id":"iem_D_40.040_-75.030_1782152640000","source":"iem","severity":"low","severityValue":25,"timestamp":1782152640000,"latitude":40.04,"longitude":-75.03},{"id":"iem_H_40.090_-74.810_1782154080000","source":"iem","severity":"low","severityValue":25,"timestamp":1782154080000,"latitude":40.09,"longitude":-74.81},{"id":"gnews_weather_495042_151","source":"google_news","severity":"medium","severityValue":40,"timestamp":1782152732000,"latitude":39.95,"longitude":-75.16},{"id":"gnews_weather_495044_183","source":"google_news","severity":"medium","severityValue":40,"timestamp":1782159000000,"latitude":39.95,"longitude":-75.16}] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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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