Right now
The most recent data we hold from NOAA arrived 4 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 18 July 2026 at 20:53 UTC. It is kept here as a record.
It is the 4th strongest of the 62 detections recorded within 20 km of this point since 13 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 18 at 4:43PM EDT until July 18 at 4:45PM EDT by NWS Pittsburgh PA
Urban PEI: 30,075 within a heuristic 50 km radius; not unique people.
Nearby, since 13 March 2026
- September 3, 2026 · score 46 · 14.8 km
- July 3, 2026 · score 34 · 18.4 km
- September 2, 2026 · score 58 · 18.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 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) | 34 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 41.7369, -79.0769 |
| Nearest City | Jamestown (43 km) |
| Urban exposure index (PEI) | 30.1K within 50 km |
| Impact Tier | significant |
| Date | 2026-07-18 — time not reported by the source |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.531a622df24ed82bca57aeb20e48f147 |
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: 2026-07-18 — time not reported.
First archived: 2026-07-18T20:44:03.371Z. 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 | Jefferson, PA; Clarion, PA; Venango, PA; Portage, OH and 9 more areas |
| Headline | Severe Thunderstorm Warning issued July 18 at 4:43PM EDT until July 18 at 4:45PM EDT by NWS Pittsburgh PA |
| Expires | 2026-07-18T16:53:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| MergedCount | 12 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.531a622df24ed82bca57aeb20e48f1475b0b6a0c.001.1","noaa_urn:oid:2.49.0.1.840.0.c9b95914f89709c2d31455f0621270b4b7f66401.001.1","noaa_urn:oid:2.49.0.1.840.0.9fb649df8b7ef718544850f7bfcb65804d96e1ed.001.1","noaa_urn:oid:2.49.0.1.840.0.d07f054b10f1dd99419f5754e9f21fbef2db3f70.001.1","noaa_urn:oid:2.49.0.1.840.0.a8f6b6ce86239cf6a03c46b1dadf460dc6d2e6b6.001.1","noaa_urn:oid:2.49.0.1.840.0.fe24f5d5e19f6ef6f25719c460d360b8a68addad.001.1","noaa_urn:oid:2.49.0.1.840.0.54faa61c5c3775d5555b5037bd4d4e2e2d35f5c6.001.1","noaa_urn:oid:2.49.0.1.840.0.5d5565ef2c7cf9565965eb0169115e85a79bbab7.001.1","noaa_urn:oid:2.49.0.1.840.0.bdc1aac973e12172c6cfa0c99ff121de2c37df4c.001.1","noaa_urn:oid:2.49.0.1.840.0.0387c6742173e9e557d90d73a8d355e5c7acf4b8.002.1","noaa_urn:oid:2.49.0.1.840.0.646f493f6814a5f25eef76b993a6a4fbf23aa6da.002.1","noaa_urn:oid:2.49.0.1.840.0.edaa375bc1c24c9d35b8589a1835aac07e796b26.001.1"] |
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 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.
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