Right now
The most recent data we hold from NOAA arrived 48 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 20:31 UTC. It is kept here as a record.
It is the 8th strongest of the 159 detections recorded within 20 km of this point since 23 March 2026. Another comparable one was recorded here earlier the same day. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 28 at 4:22PM EDT until July 28 at 4:30PM EDT by NWS Baltimore MD/Washington DC
Nearby, since 23 March 2026
- September 5, 2026 · score 16 · 2.7 km
- July 28, 2026 · score 22 · 5.9 km
- June 22, 2026 · score 22 · 12.2 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 | 0.59/1 |
| Coordinates | 37.8024, -80.4216 |
| Nearest City | Blacksburg (64 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-28T20:22:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.8f45d424a121cca6284cc08c5193dada |
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: 2026-07-28T20:22:00.000Z.
First archived: 2026-07-28T20:24:14.139Z. 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, MD; Washington, MD; Frederick, MD; Washington, MD; Jefferson, WV and 18 more areas |
| Headline | Severe Thunderstorm Warning issued July 28 at 4:22PM EDT until July 28 at 4:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-28T16:31:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 23 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8f45d424a121cca6284cc08c5193dada213418e9.001.1","noaa_urn:oid:2.49.0.1.840.0.7262dacb9e2b01b3b86656a718a90af587f204db.001.1","noaa_urn:oid:2.49.0.1.840.0.3dfdf2c281923930006db1d511ac000302827e53.001.1","noaa_urn:oid:2.49.0.1.840.0.999df35901958467fc46b568101d78936479bdc8.001.1","noaa_urn:oid:2.49.0.1.840.0.4ecbc55dcb989b96bb58216ee916e53593e91e06.001.1","noaa_urn:oid:2.49.0.1.840.0.a5c5816736bc566fb5726cd1a5d840c8a07f8861.001.1","noaa_urn:oid:2.49.0.1.840.0.2d4f1b386a609c7281c51bdc24620b671d3bc05f.001.1","noaa_urn:oid:2.49.0.1.840.0.4ba8634163a3fc4d9c42ebf773f46644689b2f38.001.1","noaa_urn:oid:2.49.0.1.840.0.ab71974b9695edd52913389011e4f7dd7e350241.001.1","noaa_urn:oid:2.49.0.1.840.0.2e6556cac66788b9fdef6216e7a0e866ebb64deb.001.1","noaa_urn:oid:2.49.0.1.840.0.d83ac2b99354bc5e29f4b06bfec401d698f26c9c.002.1","noaa_urn:oid:2.49.0.1.840.0.24d2bd61e59f39b7b1b846abdb5695b6359a41d9.001.1","noaa_urn:oid:2.49.0.1.840.0.540657b0c49550346496182059f916d058b70111.001.1","noaa_urn:oid:2.49.0.1.840.0.0590416ddbb632ea9786b7dc30fc278d71a6331c.002.1","noaa_urn:oid:2.49.0.1.840.0.8bf627ce0acb2732e27747b93a60793496574e94.001.1","noaa_urn:oid:2.49.0.1.840.0.70aa937d1a090d2d75c1abfe2b26486766430944.001.1","noaa_urn:oid:2.49.0.1.840.0.8a9e822d23839ac5d59499dfcd1241aea1976342.001.1","noaa_urn:oid:2.49.0.1.840.0.0920bd4ceb93ebfe2ff365adfa0c831699093532.001.1","noaa_urn:oid:2.49.0.1.840.0.b532309d82922e7f3ba55178e9cfee697b48f2a8.001.1","noaa_urn:oid:2.49.0.1.840.0.aeafcd1f37f16d9aa4393d7033e347f0de57c7d0.001.1","noaa_urn:oid:2.49.0.1.840.0.0d3717d1a76e43ad52eb3034a48669670d790e80.002.1","noaa_urn:oid:2.49.0.1.840.0.72d426b693951de433d2909bf092cc91ba1e80ea.001.1","noaa_urn:oid:2.49.0.1.840.0.68b24d990e749753ba5cdb1277fa56b5bfec47b0.001.1"] |
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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