Right now
The most recent data we hold from NOAA arrived 1 minute 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 22:15 UTC. It is kept here as a record.
It is the 91st strongest of the 155 detections recorded within 20 km of this point since 12 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 5:34PM EDT until July 28 at 6:15PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 4,514,626 within a heuristic 50 km radius; not unique people.
Nearby, since 12 March 2026
- July 28, 2026 · score 52 · 0.3 km
- March 17, 2026 · score 52 · 3.2 km
- August 10, 2026 · score 76 · 5.4 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 | 0.80/1 |
| Coordinates | 39.2639, -76.7213 |
| Nearest City | Catonsville (1 km) |
| Urban exposure index (PEI) | 4.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-28T21:34:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.716414decd9685d483720e8d6eea2c7b |
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: 2026-07-28T21:34:00.000Z.
First archived: 2026-07-28T21:35:55.839Z. 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 | Cecil, MD; Baltimore, MD; Carroll, MD; Baltimore City, MD; Talbot, MD and 9 more areas |
| Headline | Severe Thunderstorm Warning issued July 28 at 5:34PM EDT until July 28 at 6:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-28T18:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 13 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.716414decd9685d483720e8d6eea2c7b2ae7aed1.001.1","noaa_urn:oid:2.49.0.1.840.0.dcb571bfdd13bd23eadad0c0a476dadac97ca729.001.1","noaa_urn:oid:2.49.0.1.840.0.ef909d2ba7adc1b4d4b813083878858dae6e3671.001.1","noaa_urn:oid:2.49.0.1.840.0.2fa09b6639885894e168584fd3ab6306b76b95df.001.1","noaa_urn:oid:2.49.0.1.840.0.d3e00f4d0de6ef42c9fee825ddad0a55bc8a996f.001.1","noaa_urn:oid:2.49.0.1.840.0.84198dcd4ec2a078ea51ee8550c4e9c53931fe12.001.1","noaa_urn:oid:2.49.0.1.840.0.df5c3223901507e5fc67eb8535b7099981061121.001.1","noaa_urn:oid:2.49.0.1.840.0.5d3c948895732385ba23d9c244992f1af712b1e8.001.1","noaa_urn:oid:2.49.0.1.840.0.fefda9019124bc7ef62c4a759c4ee955400c57c5.001.1","noaa_urn:oid:2.49.0.1.840.0.1a0b4dfd1df90b57c71b2706af9a89ebfd155e80.001.1","noaa_urn:oid:2.49.0.1.840.0.54db5880ce3d315c7a30aa5a25cff64af347ff2d.002.1","noaa_urn:oid:2.49.0.1.840.0.45b27fdf91fb1a7bb3285790b279d47aec982d16.001.1","noaa_urn:oid:2.49.0.1.840.0.40066cb669fe5f40ef3243de93f43246480f333a.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.
Review the area, threshold and delivery channel in your account.
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