Right now
The most recent data we hold from NOAA arrived 13 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 21:30 UTC. It is kept here as a record.
It is the 165th strongest of the 231 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 28 at 4:50PM EDT until July 28 at 5:30PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 2,891,620 within a heuristic 50 km radius; not unique people.
Nearby, since 12 March 2026
- July 28, 2026 · score 46 · 1.3 km
- September 4, 2026 · score 46 · 3.2 km
- August 27, 2026 · score 52 · 6.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 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) | 46 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 39.3802, -77.1253 |
| Nearest City | Damascus (12 km) |
| Urban exposure index (PEI) | 2.9M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-28T20:50:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.0decc6c10e1617c1e5bfc19f2a4a9067 |
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: 2026-07-28T20:50:00.000Z.
First archived: 2026-07-28T20:54:53.926Z. 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 | Baltimore, MD; Carroll, MD; Harford, MD; Frederick, MD; Washington, MD; Frederick, MD and 6 more areas |
| Headline | Severe Thunderstorm Warning issued July 28 at 4:50PM EDT until July 28 at 5:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-28T17:30:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 9 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0decc6c10e1617c1e5bfc19f2a4a90674fbe4fe1.001.1","noaa_urn:oid:2.49.0.1.840.0.6a70a91fa54123662cfd4c998cad99e183489fa4.001.1","noaa_urn:oid:2.49.0.1.840.0.1ef72ba3892c6e2c4ebacc9f8ce61493cd202537.002.1","noaa_urn:oid:2.49.0.1.840.0.04c358f223157a2fcd6a54f988ca5c8b67161e6e.001.1","noaa_urn:oid:2.49.0.1.840.0.d5eff424ccd3400c6e012d068bbe452415db9dd5.001.1","noaa_urn:oid:2.49.0.1.840.0.c02805163dfdd37acec25678b5d4d1866b9df81c.001.1","noaa_urn:oid:2.49.0.1.840.0.f4547eaaeb280c683abcf877c51a4ede98f770d7.002.1","noaa_urn:oid:2.49.0.1.840.0.f3ca77ef539bcd23510193f263cb3234d1f89871.001.1","noaa_urn:oid:2.49.0.1.840.0.c2f8e77be74df8eb5b0838f4228696f6b311fc1d.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.
Review the area, threshold and delivery channel in your account.
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