Right now
The most recent data we hold from NOAA arrived 6 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 4 July 2026 at 22:30 UTC. It is kept here as a record.
It is the 4th strongest of the 19 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 4 at 5:30PM EDT until July 4 at 6:30PM EDT by NWS Baltimore MD/Washington DC
How we know
5 recorded sources include NOAA; independence is not established by this count.
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 | 0.68/1 |
| Coordinates | 39.0804, -79.0903 |
| Nearest City | Cumberland (69 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-04T21:30:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.e6a11b829cf85a07bf87545083ff5d04 |
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: 2026-07-04T21:30:00.000Z.
First archived: 2026-07-04T21:32:37.363Z. 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 | Charles, MD; King George, VA; Prince William, VA; Stafford, VA; Augusta, VA; Highland, VA; Page, VA; Rockingham, VA; Shenandoah, VA; City of Harrisonburg, VA; Hardy, WV; Pendleton, WV; Frederick, MD; Washington, MD; Clarke, VA; Frederick, VA; Loudoun, VA; City of Winchester, VA; Berkeley, WV; Hampshire, WV; Hardy, WV; Jefferson, WV; Morgan, WV and 19 more areas |
| Headline | Severe Thunderstorm Warning issued July 4 at 5:30PM EDT until July 4 at 6:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-04T18:30:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 23 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e6a11b829cf85a07bf87545083ff5d04a1787439.001.1","noaa_urn:oid:2.49.0.1.840.0.23b23c08c9e60267924fc7bbfd63d9d7f3918ac7.001.1","noaa_urn:oid:2.49.0.1.840.0.eb20db5a1172008abd9696d67d187dd3408c4a84.001.1","noaa_urn:oid:2.49.0.1.840.0.27d83b95b68992cc7771f2b98e1ec881d6aa82ec.001.1","noaa_urn:oid:2.49.0.1.840.0.11cb5f1a40274add75d85d2e0fd9c33b6e537766.001.1","noaa_urn:oid:2.49.0.1.840.0.243016d4135a4511facf3d8dc0da30fdf7669e4f.002.1","noaa_urn:oid:2.49.0.1.840.0.3565958ec1ea16fa35479fb0a0d987cc61c129d7.001.1","noaa_urn:oid:2.49.0.1.840.0.6ac4de5bb462456e4cc38e73b516b2e7191031d0.001.1","noaa_urn:oid:2.49.0.1.840.0.56443351dd18605da521a671593be69eb0e8bf7d.001.1","noaa_urn:oid:2.49.0.1.840.0.36339053bef2b81b3005864276c0667df9415221.001.1","noaa_urn:oid:2.49.0.1.840.0.9a8e961ae95a7494fb2ed5ae14d17813f4874553.001.1","noaa_urn:oid:2.49.0.1.840.0.6f40d9da7ab7acf702ae71928056d03659922662.001.1","noaa_urn:oid:2.49.0.1.840.0.fc2340fa96cb8c01c566176f8f022bacb4e669e1.001.1","noaa_urn:oid:2.49.0.1.840.0.1dad7d91b072a3b7c3ab9ddca11149eca5c797c0.001.1","noaa_urn:oid:2.49.0.1.840.0.09286318d4960747764216d27de0fc2ba40b44b7.001.1","noaa_urn:oid:2.49.0.1.840.0.622442f15ab77d67bb47b47305efd1c60dab7b3c.001.1","noaa_urn:oid:2.49.0.1.840.0.5854bd430f1143138719038d219306a45df713df.001.1","noaa_urn:oid:2.49.0.1.840.0.9b388f3a2dad894ecf214dc7db7711b162ad331a.002.1","noaa_urn:oid:2.49.0.1.840.0.c6b9e2bd599777168f7817ad07d352f46212709d.001.1","noaa_urn:oid:2.49.0.1.840.0.fbead930282a8ecaddadf1c04707c59ffd46b1b9.001.1","noaa_urn:oid:2.49.0.1.840.0.823ca747e561c29f292a395b664f31b7f58200bc.002.1","noaa_urn:oid:2.49.0.1.840.0.4803dedbed1c16bef07717e8fb5ec3da6365fd36.001.1","noaa_urn:oid:2.49.0.1.840.0.8db9d6cdeb9465bd68051411d5d688d7ee1d8a14.001.1"] |
| Iem TypeSummary | D |
| Iem City | 3 SSE Lahmansville |
| Iem County | Grant |
| Iem State | WV |
| Iem Wfo | LWX |
| Iem Remark | Trees were down along Morgantown Road. |
| MergedSources | [{"id":"iem_D_39.100_-78.960_1783196640000","source":"iem","severity":"low","severityValue":25,"timestamp":1783196640000,"latitude":39.1,"longitude":-78.96},{"id":"iem_D_38.710_-79.340_1783192080000","source":"iem","severity":"low","severityValue":25,"timestamp":1783192080000,"latitude":38.71,"longitude":-79.34},{"id":"iem_D_38.570_-78.760_1783190700000","source":"iem","severity":"low","severityValue":25,"timestamp":1783190700000,"latitude":38.57,"longitude":-78.76},{"id":"iem_D_39.090_-79.060_1783196280000","source":"iem","severity":"low","severityValue":25,"timestamp":1783196280000,"latitude":39.09,"longitude":-79.06}] |
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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