Right now
The most recent data we hold from NOAA arrived 9 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 28 July 2026 at 20:30 UTC. It is kept here as a record.
No stronger detection stands among the 39 recorded within 20 km of this point since 16 March 2026 — 13 others scored the same. The last comparable one was on 18 July 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 28 at 3:56PM EDT until July 28 at 4:30PM EDT by NWS Baltimore MD/Washington DC
Nearby, since 16 March 2026
- July 3, 2026 · score 22 · 6.3 km
- May 27, 2026 · score 22 · 9.4 km
- July 18, 2026 · score 22 · 11.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 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) | 22 / 100 |
| Legacy data-support index | 0.60/1 |
| Coordinates | 38.1389, -80.1653 |
| Nearest City | Salem (95 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-28T19:56:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.a24b589ac082c9cc5fd00a48124e62fc |
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: 2026-07-28T19:56:00.000Z.
First archived: 2026-07-28T19:58:42.342Z. 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 | Clarke, VA; Frederick, VA; City of Winchester, VA; Adams, PA; Cumberland, PA; Franklin, PA; York, PA; Augusta, VA; Nelson, VA; City of Waynesboro, VA and 12 more areas |
| Headline | Severe Thunderstorm Warning issued July 28 at 3:56PM EDT until July 28 at 4:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-28T16:30:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 15 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a24b589ac082c9cc5fd00a48124e62fcffab88de.001.1","noaa_urn:oid:2.49.0.1.840.0.918bb2e6e9beea7dcc34593d38f78da5c42b4781.002.1","noaa_urn:oid:2.49.0.1.840.0.230393b1b7f6c37570584479f29a3af8cd8840ca.001.1","noaa_urn:oid:2.49.0.1.840.0.f0f22a29d7c4a62b499a73335f5fe2e7c385301c.001.1","noaa_urn:oid:2.49.0.1.840.0.29ef858db502d8f3893da678622efbc224345129.001.1","noaa_urn:oid:2.49.0.1.840.0.48b8757cf47fc855e6677c03d6713aa18ce8e2dd.002.1","noaa_urn:oid:2.49.0.1.840.0.2556250f32250d6e77f79805e96df3567585e27f.001.1","noaa_urn:oid:2.49.0.1.840.0.8f2a85c6611368790652c219690cd7c7913c6868.001.1","noaa_urn:oid:2.49.0.1.840.0.23f7300148b44530e74367896f4b4d14d2c18fae.001.1","noaa_urn:oid:2.49.0.1.840.0.4474b9eccb7f9454a728a377beba1233c98ea696.002.1","noaa_urn:oid:2.49.0.1.840.0.886e81d5a0de973cb5596713ef4f2c02ed2a1fbb.001.1","noaa_urn:oid:2.49.0.1.840.0.ffad4c160b53d293e969fa088ef516f654bbbb2f.001.1","noaa_urn:oid:2.49.0.1.840.0.c3e84a3879f3c3d6fa22cb7d86f981cf05d869d1.002.1","noaa_urn:oid:2.49.0.1.840.0.bc3514260472a4e97721cd817e823bc4f9f6c340.001.1","noaa_urn:oid:2.49.0.1.840.0.49057fc73403386af2813722b57841649b7e60ec.002.1"] |
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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