Right now
The most recent data we hold from NOAA arrived 6 minutes ago, and this point is in it.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 21 September 2026 at 22:05 UTC. It is kept here as a record.
It is one of only 3 we have recorded within 20 km of this point since 16 March 2026. The last comparable one was on 17 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 21 at 4:56PM CDT until September 21 at 5:00PM CDT by NWS Huntsville AL
Urban PEI: 136,110 within a heuristic 50 km radius; not unique people.
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 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) | 37 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 32.9933, -87.7309 |
| Nearest City | Tuscaloosa (28 km) |
| Urban exposure index (PEI) | 136.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-21T21:56:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.18515cd5f16eb3f097a84671d99a2e116adcc9cd.001.1 |
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: 2026-09-21T21:56:00.000Z.
First archived: 2026-09-21T21:57:59.872Z. 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 | DeKalb, AL; Marshall, AL; Jackson, AL; Madison, AL; Pickens, AL and 7 more areas |
| Headline | Severe Thunderstorm Warning issued September 21 at 4:56PM CDT until September 21 at 5:00PM CDT by NWS Huntsville AL |
| Expires | 2026-09-21T17:05:00-05:00 |
| SenderName | NWS Huntsville AL |
| HasExactCoords | true |
| MergedCount | 10 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.18515cd5f16eb3f097a84671d99a2e116adcc9cd.001.1","noaa_urn:oid:2.49.0.1.840.0.c690e3a42bd0e11d92a62af95acd1132cfaeabb1.002.1","noaa_urn:oid:2.49.0.1.840.0.24a12d2f465b8a823964749cf85f24475b181fa0.001.1","noaa_urn:oid:2.49.0.1.840.0.8e385912f18b56b72608f0dcc346bafefc3dc052.001.1","noaa_urn:oid:2.49.0.1.840.0.5cad2543d15b9c345807288fbeb74f1cbc3349bf.001.1","noaa_urn:oid:2.49.0.1.840.0.1e370d4ef2975abd912ce4ad5705228984ff02d7.001.1","noaa_urn:oid:2.49.0.1.840.0.70ca94ec19ca83c7b374c5fbb3acdeb116df39a2.001.1","noaa_urn:oid:2.49.0.1.840.0.fac39db58235b733de76f2534bd5d09ff939e5ab.001.1","noaa_urn:oid:2.49.0.1.840.0.26503355100ac02c82d503cec7e055dbb92573ac.001.1","noaa_urn:oid:2.49.0.1.840.0.657d34972b07f9d6d1bb79ff1223eaa52d0e0b72.001.1"] |
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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