Right now
The most recent data we hold from NOAA arrived 3 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 21 July 2026 at 20:45 UTC. It is kept here as a record.
It is the 21st strongest of the 128 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 7 July 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 21 at 4:18PM EDT until July 21 at 4:45PM EDT by NWS Pittsburgh PA
Urban PEI: 16,152 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- August 5, 2026 · score 34 · 7.6 km
- May 20, 2026 · score 34 · 9.2 km
- July 4, 2026 · score 34 · 14.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 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) | 28 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 39.0262, -80.1686 |
| Nearest City | Clarksburg (32 km) |
| Urban exposure index (PEI) | 16.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T20:18:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.6499daa350e622d6c8a70260725ae068 |
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: 2026-07-21T20:18:00.000Z.
First archived: 2026-07-21T20:20:30.126Z. 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 | Monongalia, WV; Preston, WV; Randolph, WV; Monroe, OH; Noble, OH and 19 more areas |
| Headline | Severe Thunderstorm Warning issued July 21 at 4:18PM EDT until July 21 at 4:45PM EDT by NWS Pittsburgh PA |
| Expires | 2026-07-21T16:45:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| MergedCount | 22 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6499daa350e622d6c8a70260725ae068a3f9a8d8.001.1","noaa_urn:oid:2.49.0.1.840.0.3d24b1e718eb88cc17ba9eec9494d7d226507543.002.1","noaa_urn:oid:2.49.0.1.840.0.d1a217fe90416f944830df1e5eff9fef6a764226.001.1","noaa_urn:oid:2.49.0.1.840.0.e25b8082f8b7b057149a8287dbbf4595f4fd5651.001.1","noaa_urn:oid:2.49.0.1.840.0.86f4d084aaebd230bfffbaed494538adda2c0bb9.001.1","noaa_urn:oid:2.49.0.1.840.0.a2824d2f61ecab06edb5dfe4ce6770d0c940f36d.001.1","noaa_urn:oid:2.49.0.1.840.0.2b7c0af46ea6ba0b48f32c4766de7cce2cc8e717.001.1","noaa_urn:oid:2.49.0.1.840.0.0eec9792d2bca5594f87b2932211749d48399329.001.1","noaa_urn:oid:2.49.0.1.840.0.678b831dc0fba5e40ec3a447b129a261a66141d9.001.1","noaa_urn:oid:2.49.0.1.840.0.e26d5f73983b3d7b34233f7d96c07bffe865052c.001.1","noaa_urn:oid:2.49.0.1.840.0.64a58cb04851c97436a8ad826247830746c9c7ed.001.1","noaa_urn:oid:2.49.0.1.840.0.36cffd1980405570452e1fdae0a7f184d0506b8c.001.1","noaa_urn:oid:2.49.0.1.840.0.8acce1459a3a9bfa16d534a106a01126ee8b437d.001.1","noaa_urn:oid:2.49.0.1.840.0.b10c8201fbb17ec04a231be2b069b197ecaefab0.001.1","noaa_urn:oid:2.49.0.1.840.0.617c83a2fadd53f48b265a6c96ff9fbdd64716ec.001.1","noaa_urn:oid:2.49.0.1.840.0.0d21f9707c16c94d08829fdcbcbec4ac68111e1d.001.1","noaa_urn:oid:2.49.0.1.840.0.a3d11dfaee8d4ac7c1cf0685301e8eaf60053ee2.001.1","noaa_urn:oid:2.49.0.1.840.0.efe94c82c09d5f488b26a42e0e29101a1f382cac.002.1","noaa_urn:oid:2.49.0.1.840.0.a0f20f12a24c6e67d7d403428f3692df38d9bcf4.002.1","noaa_urn:oid:2.49.0.1.840.0.5a3b87cf1b4bab283df76633a5001c6a0ddee490.001.1","noaa_urn:oid:2.49.0.1.840.0.7fdb1afe90ec571ab0dd31ab36285c46b5c6be54.001.1","noaa_urn:oid:2.49.0.1.840.0.9c8537af120e6b0682cc050197b8ef0dff4fbd7f.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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