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.
3 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 20 September 2026 at 23:30 UTC. It is kept here as a record.
It is the 6th strongest of the 11 detections recorded within 20 km of this point since 26 April 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 September 20 at 5:58PM CDT until September 20 at 6:30PM CDT by NWS Fort Worth TX
Urban PEI: 1,368,737 within a heuristic 50 km radius; not unique people.
Nearby, since 26 April 2026
- September 20, 2026 · score 46 · 0.0 km
- September 20, 2026 · score 46 · 1.9 km
- May 27, 2026 · score 48 · 19.0 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 v5. 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 | 33.3859, -96.6434 |
| Nearest City | McKinney (21 km) |
| Urban exposure index (PEI) | 1.4M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-20T22:58:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.8d5391cabf89a48342b65f0c09ff20f22758b21a.002.1 |
Physical priority index · v5. 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: 2026-09-20T22:58:00.000Z.
First archived: 2026-09-20T23:04:56.774Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-20T23:10:34.265Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Dallas, TX; Ellis, TX; Grayson, TX; Bryan, OK |
| Headline | Severe Thunderstorm Warning issued September 20 at 5:58PM CDT until September 20 at 6:30PM CDT by NWS Fort Worth TX |
| Expires | 2026-09-20T18:30:00-05:00 |
| SenderName | NWS Fort Worth TX |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8d5391cabf89a48342b65f0c09ff20f22758b21a.002.1","noaa_urn:oid:2.49.0.1.840.0.ac3e9977ccbeee18b8d0fd88befddef602a6fd6a.001.1","noaa_urn:oid:2.49.0.1.840.0.9e0ab93dda7e29b26613a92e60d72433a2c218fd.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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